I agree with Trangler, there is something very strange here. I ran a whois on the domain and it's not even in Microsoft's name, it's the Perseus Development Corporation. It appears that there have been a bunch of other msn surveys on the site, so I dont think it's a fraud...though I'm not understanding why Microsoft would go through a third party for suveys...hmmm....
XP Pro for me as well, got my fingers crossed. Granted I can pick it up for $25 (wow, college does have benefits!) but nothing can ever beat free!