PowerShell MVP MoW has made available a very slick WMI Explorer tool. Think Scriptomatic but in PowerShell. In some ways I like it even better than the original Scriptomatic. It is very easy to discover WMI properties and quickly return instances all within one GUI. The tool is a PowerShell script (unsigned) that you run from within PowerShell.
You can see screenshots and download the script at http://thepowershellguy.com/blogs/posh/archive/2007/03/22/powershell-wmi-explorer-part-1.aspx
Depending on your script execution policy you might need to sign the script before it will run.
