Last week, Google announced that its display ad business is now on a $2.5 billion revenue run and its mobile ad business is on a $1 billion run rate. Google now has a billion dollar business in three major online ad categories — search, display and mobile. With Hulu announcing $240 million in revenue in 2010, the race is on for the first billion-dollar video ad business.

To put this in perspective, there are just six companies that sell $1 billion or more of television advertising a year in the U.S. — ABC, NBC, CBS, FOX, CW and Viacom — so doing $1 billion in video ad revenue is a big deal.

So, what does it take to get to $1 billion in online video ad sales?

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