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You can but you will want to burn the driver disk first. Personally if you are going to do this I'd either have an external drive with mac os to boot off of or leave a small partition on it with mac os for things like firmware upgrades and driver updates.
Just out of curiosity, why do you want to do that? OS X isn't perfect by any means but it's a nice OS with great power management.
It's still just a PC with a different OS by default. If he wants to just have Vista on there by itself, more power to him. Could be that he wants to game without having to restart the computer or something. Who knows...
Why buy a Mac at all? Part of the (very slight) premium Mac customers pay covers the cost of a good OS. Vista, by most accounts, is not all that good. I'm sure there are some very good 13" PCs with video cards with discrete memory that cost less than a 13" MBP. And you won't have to pay an additional fee for the big suck that is Vista. For the Mac you'd need to buy it separately.
Going from OSX to Vista is like downgrading from a Benz to Geo Metro, why waste money buying an MBP in the first place
OP, I would highly recommend that you keep the smallest possible OSX partition for updates. I'm not sure how easy it is to do firmware updates without going through OSX. I have a coworker who uses Linux exclusively with his MB but keeps OSX for these purposes. rEFIt is a very simple and clean boot loader that makes it easy to switch between the two.