You will find cmdlets available in PowerShell can come from two sources: PowerShell-SnapIns and (new in v.2) modules. Try this to see which cmdlets are available and where they come from:
Get-Command -commandType Cmdlet |
Sort-Object PSSnapin, Module |
Format-Table Name, PSSnapin, Module
Sort-Object PSSnapin, Module |
Format-Table Name, PSSnapin, Module
