Web video publishers are still trying to get their heads around their existing sites, which attract plenty of eyeballs but not much in the way of ad dollars. But at some point they’re going to have to figure out what will happen as video moves from the PC to the phone.

Here’s one small step in that evolution: Joost, the once-hyped video site, is going to start selling ads for stuff it shows via its iPhone app. Doing the heavy lifting will be FreeWheel, a well-regarded start-up that already handles ad-serving for some of the Web’s biggest video players.

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Yes, you can still get someone to invest in a Web start-up with zero revenue. It helps if you can insert the word “Twitter” into your pitch, though. Meet TweetDeck, a one-man outfit that makes free software that organizes your Twitter stream.

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In October, Mahalo.com founder Jason Calacanis laid off staff at his human-powered search engine. Then he announced he was hiring engineers for a mysterious new “Project A.” Today he’s unveiling it: An “answers” service designed to compete with one of Yahoo’s most successful sites.

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Tumblr is exactly the kind of start-up that’s supposed to be gasping for air in today’s dismal economy: A trendy but niche Web service with a prominent founder and exactly zero revenue. Instead, it has raised a $4.5 million funding round from Union Square Ventures and Spark Capital, which values the company at around $15 million.

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