So that's 8pm for us. Now we just wait for the onslaught.
If its anything like their other beta programs, you will have to sign into the website with your live ID, and then be given a page with your CD Key, and a link to the 32 and 64 bit downloads. All you need is the Key, the file will be all over the internet within minutes, at probubly much faster speeds than direct DL from MS.