PowerShell Quickie - What version of SharePoint 2007 am I running?
(get-item "hklm:software\microsoft\shared tools\web server extensions\12.0").getvalue("version")
12.0.0.6219 Also handy
What version of the Operating system am I running on?
(Get-WmiObject Win32_OperatingSystem).Caption
Microsoft(R) Windows(R) Server 2003, Standard Edition
(Get-WmiObject Win32_OperatingSystem).Version
5.2.3790