Not sure how accurate this is... http://seekingalpha.com/article/196953-youtube-much-more-important-than-gmail-for-google http://seekingalpha.com/article/19695

Not sure how accurate this is... http://seekingalpha.com/article/196953-youtube-much-more-important-than-gmail-for-google http://seekingalpha.com/article/196953-youtube-much-more-imp... "...we estimate that Gmail had revenue per 1,000 page views of 6 cents in 2005 which increased to about 30 cents in 2009."