this is not a cool flash site
this is a web that i just found called Be On where they are developing widgets for windows xp with rss
the interesting thing is that they are gathering people to start working wuth a community developing this widgets
they are also in the website some nice desktops app, like a app that show you videos from youtibe, images from flickr! and there is another one very creative, that shows you the level of your battery
it requires .net framweork to work