Employees at MySpace have been waiting to find out who their new ad sales boss will be, as All Things Digital reported earlier this week.

And here she is: Nada Stirratt, who until today was running digital sales for Viacom’s (VIA) MTV Networks. (You can read her goodbye memo to MTV colleagues below.)

It looks as if MySpace CEO Owen Van Natta is assembling a team of MTV veterans at his company, which he’s in the process of overhauling.

In addition to Stirratt, MySpace has brought former digital guru Jason Hirschhorn over as chief product officer. And Courtney Holt, who runs MySpace Music, had run digital music for MTV before Chris DeWolfe, Van Natta’s predecessor, brought him on board last year. Viacom hasn’t named a replacement for Stirratt.

Next week could be Stirratt’s debut in front of the entire advertising sales staff of MySpace, who are set to gather at a new seaside resort about 20 miles south of Los Angeles to get a first glimpse of the fresh direction the company is preparing to take under its new management.

The struggling social networking site, HQed in Beverly Hills, has been trying to reboot its image, spur innovation in its product and most of all, pull itself out of a too-long slump, even as longtime rival, Palo Alto, Calif.-based Facebook, has seen explosive growth.

In late August, MySpace sales and marketing head Jeff Berman left the company as MySpace hired MediaLink, a New York- and Los Angeles-based media consultancy, to help get its ad sales business back on track.

That effort has been led by MediaLink President Wenda Millard, who is well known in the ad industry and was longtime leader of the ad sales force at Yahoo (YHOO).

Getting an experienced top ad exec in place will round out a recent spate of new hiring by MySpace, including a new CTO, Alex Maghen, who moved over from its MySpace Music joint venture, and a new CFO, Mark Rosenbaum.

This has been part of Van Natta’s wholesale flushing out of most of the top execs who worked under DeWolfe.

Now, with a new team of execs, the News Corp. (NWS) property is putting the finishing touches on a master plan, which will include a new redesign of its hopelessly messy interface and doubling down on a product strategy that will center on, said one source, “what we own,” namely, music and entertainment.

Music is the obvious key leverage point, the still-bright spot of MySpace, followed by adding big entertainment categories like movies, television, gaming, video and other pop culture arenas.

Once the rejiggered product is in place, it will be up to Stirratt to sell it to advertisers.

Until we see how she does in that key job, here’s her missive to MTVers:

From: Stirratt, Nada
To: MTVN Digital Advertising
Sent: Fri Oct 09 16:34:51 2009
Subject: Thank You for Everything

Hi Everybody–

It is with mixed emotions that I write to inform you that I will be leaving MTV Networks. I have accepted the job of Chief Revenue Officer at MySpace and will be starting there later in the month.

The past 3+ years have been such a wonderful experience and I thank you for the extraordinary work you all have done to make MTVNetworks Digital stand for a best-in-class sales organization unlike any other in the business. Truly. We rocked the industry with our innovation, ideas, relationships and results. And we had a ridiculous amount of fun along the way. So thank you for everything. And a special heartfelt thanks to my leadership team of Kevin, Brad, Jason and Heather: I have learned so much from each of you and will cherish your friendship.

Xo 
Nada

(Full disclosure: News Corp. also owns Dow Jones, which owns this site.)

Caraeff is already heading up Vevo on an interim basis, but right now he’s still holding down his old job as executive vice president of UMG’s eLabs unit. At some point later this year, he is “99.99 percent certain” to be named president of the video site, according to someone familiar with Universal’s thinking. No word on who will get his old job.

That’s a good start for Vevo, which you can think of as either a “Hulu for music,” or more practically, “YouTube Music,” since the project will move videos at the world’s biggest music company from the world’s biggest video site and onto the new venture.

Running a start-up will be a new role for Caraeff, but at least he knows digital music and UMG specifically–he’s been working there since 2005. Prior to that, he ran wireless for Sony’s (SNE) movie arm.

Just as important, the appointment means Vevo will at least have cleared one hurdle that tripped up News Corp.’s (NWS) MySpace, which announced its plans to start a music site in the April 2008 but couldn’t land a CEO for the venture until MTV vet Courtney Holt took the gig in November–a couple months after the site launched.

There’s plenty for Caraeff to do: In addition to overseeing the launch of the site itself, he’ll need to staff it–while Google (GOOG) is helping Universal build and power the site, Caraeff will need to hire a “couple dozen people,” says a source familiar with his plan. A big priority: Assembling a sales force to sell the video clips.

And then? Plenty of other questions, which I raised a month ago when the deal was first announced. Forgive me, but I’m just going to quote myself here:

And even if Google’s technical expertise makes it easier for UMG to get a decent site up and running, neither company has a real track record when it comes to getting big brands to pony up for video ads, which is supposedly the whole point of the site.

Lots of people made similarly disparaging remarks about Hulu, of course. There was no way that GE’s (GE) NBC and News Corp.’s (NWS) Fox were going to be able to launch a decent site, let alone provide a challenge to YouTube. But they did, and they are. So the Vevo folks have that example to inspire them. (News Corp. is the owner of Dow Jones, which owns this Web site.)

But even if UMG gets the site off the ground, there is a considerable risk for both the label and for Google. Because if it works, Vevo will be diverting a lot of eyeballs away from YouTube–yesterday’s press release boasted that UMG’s YouTube channel has racked up 3.5 billion views.

The idea is to provide advertisers with a clean, well-lit space that will make them feel comfortable enough to spend money. But part of YouTube’s appeal is that is a riot of  the good, the bad and the WTF? You may start out watching a U2 video, and 20 minutes later end up watching a clip of a doped-up seven-year-old after a visit to the dentist. If you end up at Vevo, you’re going to have be very interested in music videos–and, at least for now, just the ones that Universal owns.

Are there enough video watchers out there to justify a business with some 50+ employees, which is the number I’ve heard Vevo/Universal is looking at? And can Universal figure out how to turn those eyeballs into more money than they’d generate on YouTube itself? Got me. Can’t wait to find out.

People familiar with the matter tell me that DeWolfe and News Corp., specifically new digital boss Jon Miller, are discussing a leadership change today. News Corp. (NWS) officials declined to comment. (News Corp. is the owner of Dow Jones, which owns this Web site.)

Sources tell me Miller hadn’t been planning on getting rid of DeWolfe (pictured above) in the near future, and that until yesterday he was still evaluating his options. News Corp. CEO Rupert Murdoch had once treated DeWolfe as a favorite and gave him significant autonomy at MySpace. But Murdoch, who brought Miller on earlier this month, has been leaning toward a change as MySpace’s traffic has stagnated and its buzz and momentum have moved to Facebook.

Still, Murdoch had left the decision about the site’s leadership to Miller, his new hire, sources said. One possibility: Elevating DeWolfe to a nonexecutive advisory position.

Those options narrowed last night once TechCrunch ran a story claiming that News Corp. had hired a headhunting firm to “scour for possible replacements” for DeWolfe.

News Corp. hadn’t actually hired a headhunter, I’m told by multiple sources. But I’m also told that the report was enough to spook DeWolfe into calling Miller to ask what his plans were. That conversation led to today’s negotiations, which will likely lead to his stepping down as CEO, although he may remain affiliated with MySpace in some capacity.

Meanwhile, News Corp. has been talking to Van Natta (pictured here) about taking DeWolfe’s place. Van Natta, who had been a highly regarded executive at Facebook, was at one point the leading candidate to head up MySpace Music, which launched last fall, and the two sides held extensive conversations.

But Van Natta, like many other potential hires for that position, bristled at the job’s org chart: Rather than a standalone company, a la Hulu, the site News Corp. set up with GE’s (GE) NBC, MySpace Music is simply a unit of MySpace, reporting to DeWolfe. MTV executive Courtney Holt eventually took the job.

But Van Natta’s fate has remained closely intertwined with MySpace anyway. Project Playlist, the free music-streaming site he took over last fall, has seen traffic plummet after MySpace, along with Facebook, cut off the site’s access to their users, a move prompted by lawsuits from several major music companies.

Van Natta has made some headway at extracting the company from its legal mess, which predated his hiring, and he has hammered out a settlement with EMI Music Group. But Playlist is still being sued by Warner Music Group (WMG) and Vivendi’s Universal Music Group, and even music sites that aren’t in legal trouble are struggling to keep their heads above water. Plenty of Silicon Valley watchers wonder why Van Natta landed at Playlist in the first place and think that he has been looking for a way out.

Here’s a video of DeWolfe talking with BoomTown’s Kara Swisher a little more than a year ago when MySpace opened a new office in San Francisco. Below that is a video of Van Natta talking to Swisher in 2007 about Facebook’s ill-fated “Beacon” project.

As of this morning the deal, first reported by CNET last week, still wasn’t done. But at this point there doesn’t seem to be anything left beyond “i”-dotting and “t”-crossing. I’m told that Holt may be showing up at the MySpace Music party in San Francisco tomorrow (along with Lionel Richie and BoomTown’s Kara Swisher).

News Corp.’s (NWS) social network has been casting about for someone to run the site, which is a JV of sorts with MySpace and the big music labels, for most of this year. What took so long? The conventional wisdom is that the job doesn’t appeal to many would-be executives because it’s not really a CEO job–it’s a job running a unit of MySpace.

But even if you buy that, this would still seem like a step up for Holt: MTV still–amazingly–doesn’t do much with digital music. And MySpace was a major player even before it launched the new site.