iLove SharePoint: PowerShell & SharePoint - Quick Start
Now THIS is the way you load a SharePoint library into PowerShell.
LoadWithPartialName is dead!!! Yea!!!
#load Microsoft.SharePoint.dll
[System.Reflection.Assembly]::LoadFrom("$12HivesDir\ISAPI\Microsoft.SharePoint.dll")
iLove SharePoint: PowerShell & SharePoint - Quick Start