In addition to the above, you can also use PowerShell to access WMI. The Get-WMI cmdlet and the three type accelerators ([wmi], [wmiclass], and [wmisearcher]) enable basic administrative access to WMI.
Additional WMI features are added in PowerShell V2, currently in beta testing. V2 CTP 1 has been released, and a CTP 2 is due out soon.