Here's a prototype for the Google Personalized Homepage. The idea is simple but simulates a standard installer. On the right side of the window you can see a installer gadget with check marks to indicate which components are currently installed. Multiple gadgets would interoperate with one another, so a video search result could be played in the video player. There are a few more, Live Television with the EPG guide, video browsing, user playlists and all the other obvious things.