Microsoft's upcoming PowerShell release promises a whole new world for admins. Exchange admins in particular are going to need to know PowerShell in order to administer Exchange 2007.
As part of the Technet site, MS has started developing a Scripting Centre around PowerShell. The 'home page' is at http://www.microsoft.com/technet/scriptcenter/hubs, which points off to a Script Repository of sample PowerShell Scripts.
The script repository is a bit thin thus far, but I'm confident that it'll get more and more scripts as time goes by. I'm hoping to add to my own script repository at www.reskit.net.