He made this little nice tool for everyone.. Click Generate and it will Generate and copy the serial to the clipboard for you. All the keys have been put together from MS in a randomized order. This was made so you don't have to keep looking for keys each time a new Windows 7 is leaked or your going to reinstall/install Windows 7.

The generated keys are working for 32 and 64bits and also on Beta and RC builds.. Even the latest one, 7127