The Magical Jelly Bean Keyfinder is a freeware utility that retrieves your Product Key (cd key) used to install windows from your registry. It has the options to copy the key to clipboard, save it to a text file, or print it for safekeeping. It works on Windows 95, 98, ME, 2000, XP, Server 2003, Windows Vista, Office XP, Office 2003, and Office 2007.
Various bug fixes including Windows 2000 key retrieval
Disabled change key option temporarily. (It wasn't working anyway.)
Tools and Utilities
2.0 Beta 4
Product page: here