I regularly recommend and often refer to this document my good friend Alan Renouf put together Quick Reference Guide for PowerCLI. It is really handy guide to pin up by your desk when you need to remind yourself of a cmdlet and maybe one of the most common usages for it.
I’ve been spending a lot of time recently checking out the PowerShell cmdlets for Active Directory in Windows Server 2008 R2 and they have also recently been made available for downlevel versions of Windows Server. I figured it would be handy to have a similar type Quick Reference Guide for these Active Directory cmdlets so I put the AD PowerShell Quick Reference Guide together.
Hope you find it useful.