Yahoo has apparently decided to close it's video service.
Here's a portion of an email I just received:
Dear Yahoo! Video user,
After careful consideration, we will be removing all general user-generated content upload capability and user-uploaded video from Yahoo! Video. As a result, your videos, user profiles, ratings, favorites, and playlists will no longer be available after March 14, 2011. User video content from Yahoo! Video that remains embedded on third party sites will no longer be playable after March 14, 2011.