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First, my two books so far:
There are too many good books to list them all, but here are some favorites:
- PowerShell In Action, 2nd Edition by Bruce Payette
- Windows PowerShell Cookbook (2nd edition) by Lee Holmes
- Professional Windows PowerShell Programming by Arul Kumaravel, Jon White, Michael Naixin Li, and Scott Happell
- Learn PowerShell in a Month of Lunches, 2nd Edition by Don Jones and Jeffery Hicks
- Learn PowerShell Toolmaking in a Month of Lunches by Don Jones and Jeffery Hicks
eBooks
- Mastering PowerShell by Dr. Tobias Weltner
- Introduction to PowerShell by Don Jones
- Windows PowerShell by Frank Koch
PowerShell also shows up in many books on Active Directory, Exchange, Windows Server, and SQL Server.