Check this useful links about PowerShell and SharePoint 2010.
Microsoft TechNet
Windows PowerShell for SharePoint Server 2010 reference
MSDN Blog – Jet Li
SharePoint 2010 with Windows PowerShell Remoting Step by Step
SharePoint Joel
Practical Windows PowerShell for SharePoint 2010
PowerGui.org Reference
SharePoint 2010 PowerShell Cheat Sheet
CodePlex
SharePoint Management PowerShell scripts
