Register at PowerTogether.com, watch three webcasts about Windows Vista, wait six to eight weeks, and you’ll get a free legit copy of Windows Vista Business in the mail. You can do the same thing to get a free copy of Office 2007 as well.
Good luck registering. The site’s hammered. And yep, it’s legit.
Of all the versions of Vista they’re making, it really seems like Business is the one that everyone should get. Home Basic is crippled and doesn’t even include the new UI, Home Premium has completely superfluous ‘media center’ junk thrown in, and Ultimate is complete overkill.