PowerTab is GREAT. If you don't know about it go to http://thepowershellguy.com/blogs/posh/pages/powertab.aspx

and download a copy. Tab completion on WMI and .NET objects, besides nearly everything built into PowerShell by default. The reason for this post is to point out that there's some REALLY interesting stuff happening around PowerTab and PowerShell 2.0 that is definitely worth your time to check it out!