I set up an account to download Windows 7 Beta a while back, and i wasnt able to download it, and now i can...where can i find the product key was given at the time and can i use it to download the beta now and use it, or should i just wait till tomorrow and get the RC?

At this point, you might as well wait until tomorrow and get the RC. The beta's no longer available through official channels - not even to TechNet/MSDN subscribers. All attention is now being focused on the RC... You'll need to go to the download page and you can get another key.