Perhaps more impressive than the huge viewership numbers is the average videos per viewer at YouTube. The average YouTube visitor watched more than 53.2 videos in October '08 -- that's almost two per day. Viacom was next closest, pushing just under 12 videos per user.
Hulu also had a good showing, serving up 235 million videos to 24 million viewers -- about 10 per visitor, making Hulu the sixth-largest video site in the US. However, while the average online video length was only 3 minutes, the average length of a Hulu video was 11.6 minutes -- likely because of the movies and full-length TV episodes that the site serves up.
Top U.S. Online Video Properties* by Videos Viewed
Total U.S. -- Home/Work/University Locations