Okay, you still want to go through the official Microsoft Vista site to get your Activation Key, but if you don't feel like waiting for Microsoft's servers to unchoke and let you get the actual DVD image, here's an
alternate link courtesy of BetaNews.com.
Now to use that alternate download link, you'll need a download manager -- otherwise, you're going to end up only downloading about 13Mb of the image before it thinks you've got the whole thing. Now if you're using IE 7 (and if you're not, WHAT THE HELL IS WRONG WITH YOU?!) you can get the Free Download Manager Add-On from
here.