Paid search has come to YouTube. Users can pay to have their videos appear in a right hand sidebar called "Sponsored Videos" in the results of desired search terms.
It works pretty much exactly like AdWords. You bid on terms, set daily limits, etc. You only pay when someone clicks to watch.
Check out YouTube's YouTube video for more details:
Introducing SES Online
Want to view one of the sessions you missed or listen to an especially informative presenter a second time? SES New York sessions are available for purchase on ClickZ Academy's new e-Learning site. SES is now Online!