Just recieved a email from MS this is part of it

"Windows 7 Release Candidate

Notice: Downloads will end August 20

Thanks for all your help building Windows 7. We are on our way to the last big milestone: Release to Manufacturing. Starting on October 22, you’ll see it on PCs and store shelves. As we gear up for that, it’s time to wind down the Release Candidate testing program.

If you or a friend needs a download, you’ve got time. We’ll continue to offer the RC download until August 20, 2009. After that, you won’t be able to get the download, but if you have the bits, you can still install the RC and get a key if you need one. (To get a key, just go to the Downloads page and follow the instructions.) "

Another bit is that each key can be used for up to 3 computers - so the main thing is having the download burned to a DVD. I would not suggest anyone obtain from a 3rd party - as they are very likely to be compromised - especially after the official downloads cease.