See below for sections on Commercial training, free online traning and books.
Commercial Training
Microsoft: Automating Windows Server 2008 Administration with Windows PowerShell
Course 6434: Three days; Instructor-Led. Covers V1 only.
http://www.microsoft.com/learning/en/us/syllabi/6434afinal.mspx
Microsoft: Windows PowerShell for Administrators
Course 50025A: Three days; Instructor-Led. Covers V1 only.
http://www.microsoft.com/learning/en/us/syllabi/50025afinal.mspx
SAPIEN: Self-paced Training, Online Training, Classroom Training, and Private On-site Training
http://www.scriptinganswers.com/Training.asp
CBT Nuggets: On The Job Training Series: Windows PowerShell
http://www.cbtnuggets.com/webapp/product?id=456
K Alliance: Windows PowerShell Training Courses
http://www.kalliance.com/microsoft-it/windows-powershell.htm
The SANS Institute PowerShell Training COurse
http://www.windowspowershelltraining.com/
Winstructor: Windows PowerShell Training
http://www.winstructor.com/products/Windows-PowerShell-Training.html
Verhoef Training: Windows PowerShell (UK)
http://www.verhoef-training.co.uk/outlines/WNPS.htm
TrainSiganl: Exchange Server 2007 PowerShell Course Outline
http://www.trainsignal.com/product_master_page_exchange_server_2007_powershell.aspx?ProductId=36
KOENIG: PowerShell for Windows Server 2008
http://www.koenig-solutions.com/training/Powershell_admin2008.asp?gclid=COy62pzC6JoCFQQ9ZgodHzZ2CA
Free Online Training
ExclusivelyExchange provides excellent free online resources for learning more about PowerShell and Exchange.
Books
Mastering PowerShell - a free e-book by Dr Tobias Weltner
http://powershell.com/Mastering-PowerShell.pdf
Windows PowerShell in Action (1st Edition)
http://www.manning.com/payette/
Windows PowerShell in Action (2nd Edition)
http://www.manning.com/payette2/ (in progress currently - MEAP)
Windows PowerShell™ v2.0:TFM
http://www.sapienpress.com/powershell3.asp
The first edition is available for free at:
http://www.primaltools.com/downloads/communitytools/ under the PowerShell TFM V1 ebook section.
Windows PowerShell Cookbook
http://oreilly.com/catalog/9780596528492/
Windows PowerShell Pocket Reference:
http://oreilly.com/catalog/9780596521783/
Microsoft Windows PowerShell Step By Step:
http://www.microsoft.com/learning/en/us/book.aspx?ID=10329&locale=en-us
Windows PowerShell Unleashed:
http://my.safaribooksonline.com/9780672329531?portal=samspublishing
Windows PowerShell(TM) 2.0 Administrator's Pocket Consultant:
http://www.microsoft.com/learning/en/us/Book.aspx?ID=12789&locale=en-us
Windows PowerShell(TM) Scripting Guide:
http://www.microsoft.com/learning/en/us/book.aspx?ID=9541&locale=en-us
Windows PowerShell(TM) 2.0 Best Practices:
http://www.amazon.com/Windows-PowerShell-2-0-Best-Practices/dp/0735626464/ref=sr_1_11?ie=UTF8&s=books&qid=1261145411&sr=8-11
Professional Windows PowerShell:
http://www.wrox.com/WileyCDA/WroxTitle/Professional-Windows-PowerShell.productCd-0471946931.html
Professional Windows PowerShell Programming: Snapins, Cmdlets,
Hosts and Providers:
http://www.wrox.com/WileyCDA/WroxTitle/Professional-Windows-PowerShell-Programming-Snapins-Cmdlets-Hosts-and-Providers.productCd-0470173939.html
PowerShell in Practice:
http://www.manning.com/siddaway/ (in progress currently - MEAP)
Pro Windows PowerShell:
http://www.apress.com/book/view/9781590599402
Windows PowerShell 2 For Dummies:
http://www.dummies.com/store/product/Windows-PowerShell-2-For-Dummies.productCd-0470371986.html
Essential PowerShell:
http://vig.pearsoned.com/store/product/1,1207,store-15080_isbn-0672329662,00.html
Effective Windows PowerShell:
http://keithhill.spaces.live.com/blog/cns!5A8D2641E0963A97!6930.entry
(free ebook)
Windows PowerShell tips (Don Jones):
http://www.concentratedtech.com/upload/2/21powershelltips.pdf
www.concentratedtech.com/upload/2/21powershelltips.pdf
Topic Specific Books
Managing Active Directory with Windows PowerShell: TFM®:
http://www.sapienpress.com/ad.asp
Managing VMWare Infrastructure with Windows PowerShell: TFM®:
http://www.sapienpress.com/vmware.aspMicrosoft SQL Server 2008
Microsoft SQL Server 2008 Administration with Windows PowerShell:
http://www.wrox.com/WileyCDA/WroxTitle/Microsoft-SQL-Server-2008-Administration-with-Windows-PowerShell.productCd-0470477288.html
Professional Windows PowerShell for Exchange Server 2007 Service =Pack 1:
http://www.wrox.com/WileyCDA/WroxTitle/Professional-Windows-PowerShell-for-Exchange-Server-2007-Service-Pack-1.productCd-0470226447.html
www.wrox.com/WileyCDA/WroxTitle/Professional-Windows-PowerShell-for-Exchange-Server-2007-Service-Pack-1.productCd-0470226447.html
Scripting SQL Management Objects in Windows PowerShell:
http://www.wrox.com/WileyCDA/WroxTitle/Scripting-SQL-Management-Objects-in-Windows-PowerShell.productCd-0470279354.html
Microsoft PowerShell, VBScript & JScript Bible:
http://eu.wiley.com/WileyCDA/WileyTitle/productCd-0470386800,descCd-description.html
eu.wiley.com/WileyCDA/WileyTitle/productCd-0470386800,descCd-description.html
Thanks
Thanks to Shay Levy, Aleksandar Nikolic, and Max Trinidad for helping put this list together and thanks for David Moravec for the list of books