http://www.microsoft.com/windows/windows-7/ idk if its still alivialbe to download... I installed it, took almost a day but i had work all day so it did not bother me. So far its ok. Nothing amazing. Have not ran to any problems other than my Google Chrome not working...
I'll wait till the wrinkles have been straightened and the thing has been patched. I likes to keep me machines healthy mate.......
Save for a few driver issues (no doubt since it's a beta), it's running pretty smooth on my gaming pc. Gonna try it on my Macbook soon enough. One thing that kills Vista is driver support and hopefully Windows 7 doesn't fall under that category.
I believe the beta may have been taken down by MS because of heavy traffic but it may be back up by now. I'll look for a link and edit my post if I can find one. Edit: Nope its back online.