A few months ago, Google announced that they would be shutting down their Google Video service. Well, they set a date and that date is today, April 29, 2011. Honestly, they should have shut it down the day they bought YouTube.
Archive Your Google Video Content
Anyway, what does this mean for you? If uploaded any content to the Google Video service, then you have until May 13th to manually download your clips. Google will then start deleting these videos off of their servers and probably migrating them over to YouTube.