Google is quite busy experimenting with various Ads formats for its customers. But now it has come with an altogether new Ads. AdSense launched YouTube Ads for Indian Publishers on 1st August 2008. Even though this service is still in beta, there are many new advantages available.
After following Video Units link from your AdSense account, Google asks you to confirm linking AdSense to your YouTube account. At the end of it, you get to design your own AdSense-enabled YouTube player which will appear on your website. As part of designing process, one can choose size, color as well as keywords & categories for custom the AdSense player.
When you place a video unit on your website, you’ll earn revenue from two types of ad formats: companion ads, which sit above your video content within the player and can be either text or image-based, and text overlay ads, which appear in the bottom 20% of the video content area. Ads on video units can be paid on either a cost-per-click or cost-per-thousand impression basis.
This was found on the AdSense Blog.