Checkout the PowerPack available for PowerGui. If you've been reading my blog you know I'm a huge fan of both PowerShell and PowerGui which sits on top of PowerShell. In this PowerPack Jonathan has made 53 different node available. That's a HUGE amount of effort. Checkout the original post on Dmitry's Blog:

http://dmitrysotnikov.wordpress.com/2008/07/30/exchange-2003-powerpack/

PowerGui Exposes the PowerShell code behind each node and action allowing you to learn much more about managing Exchange 2003 from PowerShell than ever before!

Happy scripting!