Google Video seems to be testing ways to integrate Google Video Ads into their free videos via the old trick of television style commercial break sponsorships.
Instead of using the MSN method of serving the video commercial before the video, on on the bookends of the video, Google is inserting commercial breaks in the videos themselves.
Nathan Weinberg points to the Charlie Rose clip from Google Video. Once you begin watching the video you’ll notice two blue boxes in the video time progress bar.
When the video reaches the blue squares, it starts a commercial, 15 seconds in length.
You can skip the blue boxes, but once the commercial starts, you need to go to the end of it to return to the video.