Next time you search on Google you may notice video ads included with the "Sponsored Links" ads. For example if you do a search for "cell phones" you will most likely see something similar to the image below.
If you look at the bottom right hand side of the image above you will notice an ad for Blackberry cell phones. The Blackberry ad is like any other AdWords ad but once you look below the display URL you will notice a link that says "Watch Demonstration".
Here is an image of the BlackBerry AdWords ad:
Once you click on the "Watch Demonstration" link a small video box will open up and a 30 second video clip will play. The image below is an example of what the BlackBerry ad looks like: