Yup, I've been running Vista on mine since the day i bought it. Use Vista 95% of time Mac 5%.
Works a treat, only problem is on the new MBP's, nVidia havent actually released ANY drivers for the 8600M GT. The hacked drivers out there are fine, but ofcourse nVidia + Dual View = NO! External monitors are a no go in Vista atm but this is because of incredibly poor nVidia support.