Since Google acquired YouTube in 2006, financial analysts everywhere have examined the $1.65 billion deal. How would Google make money from the popular video-sharing site, where, according to Google, clips are uploaded at a stunning rate of 10 hours' worth per hour?
Those who follow Google assumed the company would sell ads for the clips, but what's become clear over the last two years is that the way to do this successfully is, well, not clear.

Now Citigroup Investment Research's Mark Mahaney has stepped forward to project that Google will reap more than $1 billion in display advertising revenue over the course of 2009 by selling ads against YouTube content, Google Videos, Images, Maps and Finance, and DoubleClick.

Mahaney made his claim in a June 19 research note in which he predicted that YouTube would make Google $500 million in display advertising sales, which he said will represent 35 percent, or $8.5 billion of the total Web advertising spending in 2008.

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