KeyFinder Thing Lite is a simple utility created by our friend "Matt Chugg" to retrieve the Serial numbers or CD Keys of Microsoft software installed on your system.
It includes options to export the list of found keys and a search option to find keys not included by default.
It can retrieve almost all Windows product keys including XP, Vista and 7. You can also retrieve Office product keys including Office 2007 and 2010.

Its very small and portable utility so you don't even need to install it. Simply run the EXE file and get the key. You can carry it in your USB drive as well.
You can download it using following link:
This article was posted by VG in following section: Microsoft Office, Software.
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Sawmendra
Magical Jelly Bean Keyfinder is another good one
It allows you to change the keys also.
Samprikta
Doesn't works on Windows 7 x64 SP1