Take a look at the finalists' videos on the HHS YouTube channel or spin through this playlist:
Have your say about which ad you think is most effective in increasing knowledge and prevention of H1N1. The winner will receive $2500 and have his/her PSA aired on live television. Voting ends at midnight on September 8.
Ramya Raghavan, YouTube News & Politics, recently watched "Ask the Chairman: A Virtual Townhall."