PowerShell is a great tool for administrating both workstations and servers.  If you are new to PowerShell it can be hard to figure out where to start.  The easiest thing I found besides just trying commands in the shell is to read about it.  TechNet has allot of resources including the Windows PowerShell Cmdlet Help Library.  This will give you a good idea of some of the built in cmdlets that are available.  Check out the link below and let us know what you think.

TechNet Windows PowerShell Cmdlet Help
http://technet.microsoft.com/en-us/library/dd347701.aspx

Additional Help
Scripting Guy Blog
PowerScripting Podcast