Google Video has a couple of killer-app features that allow you to link or jump ahead to any point in a video, regardless of what has been loaded into cache already.
With other progressive flash videos (all others?) like YouTube for instance, a video may begin playing right away from zero seconds but you must wait for the progressive download to exceed the point you want to jump ahead to.
With Google Video, you can jump ahead to any point at any time and the video will auto-play from the new point, continuing on with a progressive load forward.
Note in the screen-capture above, I placed the playhead at 2:07 seconds and the video began to load from there.
Not only is this an exceptional interface feature, this is a clever and efficient use of bandwidth.
Furthermore, Google Video is set up so that you can actually link to any second in the video.
Here is the normal link to the example Rocketboom video: