The InsaneWare Keyfinder is a nice utility that retrieves your Product Key (cd key) used to install windows from your registry. Compatible on systems with 98, NT4, 2000, XP, Office 97, Office XP, and 2003. The utility is handy if you have lost your original installation product key or if your business is being audited. The command line version would be a handy tool for network administrators or if your computer can no longer boot.