CD Key Seizer is a simple tool for viewing your Windows and Office product keys.
The program is portable, so there's nothing to install - just download and run the single executable file.
In theory you should then see your Windows and Office product keys. In practice, life isn't always so straightforward, and on our test PC it detected that Office 2010 was installed, but displayed no key at all. Perhaps we were unlucky, but there's clearly a problem there.
Also, the program could benefit from an option to copy the key to the clipboard. Right now there's no button, no right-click menu, no Ctrl+C support, nothing: if you need to enter the key elsewhere you must manually retype it, which seems a shame.
The program's portability is a plus, though, and the author clearly has plans for it ("future versions will retrieve keys for many more software installs", he writes). If you just need a portable Windows product key viewer then it may be good enough.