Exchange Webcast info....
Here are the scripts I used in my session this morning. You can also get more scripts from the Technet Script Center for Exchange. Also, the Technet Script Center is a fantastic location of sample scripts for a wide variety of products and technologies from Microsoft. I have used scripts from this site on Exchange, ISA and Windows Server/Clients.
Some additional links....
Windows PowerShell Download (for Vista - Other OSes at bottom of linked page)
Cheers!