My friend Dave Williams just referred me to a project called Konfabulator. Check it out - it's really sweet. It installs a bunch of widgets that you can place on your desktop for things like weather, web searching, calander, clocks, etc. It has full transparency built in, and it uses anti-aliased fonts, so the eye candy factor is farily high. They also have a "workshop" application that you can use to create your own custom widgets. There's also the added plus of the application being completely cross-platform.