I just stumbled on this and don’t know how long this has been the case. It looks like Google Video is using Flash to deliver video (exclusively, from what I can gather).
This makes a lot of sense because Flash can deliver high quality video without any sort of media player download. When Google Video first debuted, Google chose some weird, open source platform that required a download.
As a lot of content providers are realizing Flash is probably the best way to deliver on-demand video over the web today. It’s nearly 100% install base, quick buffering and streamlined player results in a much simpler, more seamless experience.
As much as Google would hate to admit it, Flash is a great way to deliver rich content and applications to a multitude of platforms and devices. Google and Microsoft may be headed on a collision course, but the other viable “platform” out there is Adobe’s Flash.