Someone asked me to recommend a few books, so here they are:

1) Windows PowerShell Cookbook by Lee Holmes (from PS Team)

2) Windows PowerShell in Action by Bruce Payette (from PS Team)

3) For Exchange specific stuff, I actually haven't tried any (makes sense as we were writing code most of the time :). Here are a few I dug up on the web, they look promising:

In fact, a few guys I know wrote a very nice book that should definitely be on the top of the list.

 

 

Here's to more books, fame and fortune from these fine authors!