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:
The Original Search Marketing Event is Back!
SES Denver (Oct 16) offers an intense day of learning all the critical aspects of search engine optimization (SEO) and paid search advertising (PPC). The mission of SES remains the same as it did from the start - to help you master being found on search engines. Early Bird rates available through Sept 12. Register today!