There are a lot of good websites, articles, webcasts, blogs, and bloggers on PowerShell. This is by no means an exhaustive list of resources. The list below is simply meant to help you jumpstart your adventure with PowerShell and SQL Server. Bear in mind that beyond this list, there are a lot more to explore! Enjoy the adventure!
Learn Windows PowerShell in a Month of Lunches
by Don Jones
PowerShell 2.0 TFM
by Don Jones
PowerShell and WMI
by Richard Siddaway
by Richard Siddaway
Windows PowerShell 2.0 Administrator's Pocket Consultant
by William R. Stanek
Windows PowerShell Cookbook
by Lee Holmes
Windows PowerShell in Action, Second Edition
by Bruce G. Payette
Administrator's Guide to PowerShell Remoting
by Dr. Tobias Weltner and Aleksandar Nikolic
Effective Windows PowerShell
by Keith Hill
http://rkeithhill.wordpress.com/2009/03/08/effective-windowspowershell-the-free-ebook/
Layman's Guide to PowerShell Remoting
by Ravikanth Chaganti
Mastering PowerShell (free e-book)
by Dr. Tobias Weltner
PowerShell 2.0 One Cmdlet at a Time
by Jonathan Medd
http://www.jonathanmedd.net/wp-content/uploads/2010/09/PowerShell_2_One_Cmdlet_at_a_Time.pdf
Secrets of PowerShell Remoting
by Don Jones and Dr. Tobias Weltner
WMI Query Language (WQL) via PowerShell
by Ravikanth Chaganti
PowerShell.com
PowerShell Magazine
PoshCode—PowerShell Code Repository
PowerShell Survival Guide
Technet Script Repository
PowerShell V3 Guide
http://social.technet.microsoft.com/wiki/contents/articles/4725.powershell-v3-guide-en-us.aspx
Hey Scripting Guy! Blog
Scripting with PowerShell—5 Part Webcast
http://technet.microsoft.com/en-US/scriptcenter/dd742419.aspx
Don Jones
http://www.windowsitpro.com/topics/powershell-scripting/don-jones-on-powershell
Richard Siddaway
Jeffery Hicks
Shay Levy
Lee Holmes
Ed Wilson (Hey Scripting Guy!)
Ravikanth Chaganti
Dr. Tobias Weltner
Niklas Goude
Keith Hill
Doug Finke
Thomas Lee
Joel Bennett
Jonathan Medd
Steven Murawski
Aleksandar Nikolic
Allen White
Laerte Junior
Aaron Nelson
Edwin Sarmiento
Chad Miller
Max Trinidad
http://www.maxtblog.com/2011/10/sql-server-powershell-smosimple-way-to-change-sql-user-passwords/
Donabel Santos
Quest PowerGUI
Sapien PrimalScript
SQLPSX is a set of modules that wrap SMO objects into easier-to-use functions. This is a project maintained and contributed to by Chad Miller, Mike Shepard, Laerte Junior, Steve Murawski, Kriszio, and Max Trinidad.