Last Friday, both the AdSense Blog and the AdWords Blog announced they have launched new video ad formats for AdWords advertisers to use and publishers to place on their sites.
The new ad formats are 728x90 Leaderboard, the 120x600 Skyscraper, and the 160x600 Wide Skyscraper. The old formats include the 300x250 Medium Rectangle, the 336x280 Large Rectangle, the 200x200 Small Square, and the 250x250 Square.
For more information on the publisher side, see the AdSense Video ads help documentation. For more information on the advertiser side, see the Guide to Google Video Ads and Video ad demo page.
Forum discussion at WebmasterWorld.