Infopirate.org

This freeware let's you create widgets for your Windows or Mac:
Amnesty Hypercube is more than just a new desktop widget platform.
It's also the easiest way to collect, manage, share and publish "web widgets" -- snippets of code meant for your blog, home page or MySpace profiles.
Already using Sidebar? Any widget in Amnesty Hypercube can be pushed into your Sidebar with one click, which makes it a perfect extension to Vista's native widget environment.

http://www.amnestywidgets.com/HypercubeWin.html 

Adam Pash of Lifehacker recommends Mac OSX users download Adium 1.0. Among several attractive user interface tweaks, Adium has added new account management features, improved privacy settings, and better iTunes integration.