If you like me simply did the install without any care for the Product Key and you’re getting closer to that ‘doh! I’m going to deactivate soon!’ well, look no further, because it took me a few searches on Microsoft to find this Key Generator of sorts!
Simply visit this site: Windows 7 Release Candidate
Then simply select your Processor type and Language, and you’ll be prompted for your LiveID.
In my case, that meant copying/pasting the URL into IE, and logging in equaled my Product Key
So, get out there, generate your keys and get your Win7 set and running… until 2010 ;)