Great external PowerShell resources (in alphabetical order):

• Aaron Nelson – http://sqlvariant.com/wordpress/
• Allen White – http://sqlblog.com/blogs/allen_white/default.aspx
• Chad Miller – http://sev17.com
• Don Jones – http://www.windowsitpro.com/blogs/PowerShellwithaPurpose
• Ed Wilson – http://technet.microsoft.com/en-us/scriptcenter
• Sean McCown – http://www.midnighdba.com/DBARant