Konfabulator 2.1
Yeah baby! Not only did Yahoo! buy Flickr a while ago, they've also acquired the coolest program of cool programs namely Konfabulator! So why am I cheering you say? Well, because they made it freely available for everyone! No more registering and paying $20,-. Get it for free now @ http://www.konfabulator.com.
If you don't know what Konfabulator actually is, think of it as a collection of small desktop programs (called Widgets) with nifty graphics bringing to you the latest weather, stock information etc. Pretty much everything you want. And if your desired widget isn't available yet, then go write your own :-)