Microsoft’s Stephen Rose has announced on the Springboard Series Blog that you will not be able to download Windows 7 RC after August 15. You will still be able to install it and get license keys after August 15.
I just found out today that I will be one of a small group of Microsoft MVP Bloggers who will be blogging on Amazon.com about Windows 7. I don’t have the URL for the blog yet, but rest assured, I will post it here when I get it. That should be fun!