Over this weekend, Google added a "Video Sitemaps" section under Google Webmaster Tools's "Lab" section. When you access it, it tells you: "Video Sitemaps Errors. We are constantly updating our data, so please keep checking back with us to make sure your sitemaps are healthy."
Matt Cutts has said that videos and video sitemaps is one, of many, areas Google's search quality team will focus more on over the course of the year.
Here is a screen shot of the report: