konfabulator lets you add little fun attractive objects to your desktop (clocks, weather tools, games, etc.)http://www.konfabulator.com/
"Let's just get this out of the way... Konfabulator is now free. Yup. If you download version 2.1 you know what you'll never ever see? That's right a registration reminder. Fear not, there's nothing sneaky in there, no spyware, no ads, nothing that's keeping track of information and sending it to us... it's pure, uncut Konfabulator goodness. "
Yahoo bought it out and made it free.