The wife bought a Macbook Pro last year. Best decision ever. Boot Camp is a standard program for Mac's that allows to you run Windows on it really well. She does school work 'n' such on the Mac side, I play PC games on the Windows side (surprisingly plays Crysis just fine). It's tits.
It's completely stupid proof and no computer g3@k sp33k or 1337 haxorz knowledge is required to make it run Windows. So if you're unsure if your Mac will play nice with your brother's PC but are still thinking of buying Mac, I strongly recommend it for its Windows capabilities.
I hate Mac. I hate Mac so much, I won't even buy an iPod. Unfortunately, AAFES (Another Agency Fucking Every Soldier, I mean Army/Air Force Exchange Service), sells only iPods. So I've got a friend back home doing a Zune run for me.
But, yeah, I hate Mac. Its annoying, its disgustingly expensive, and by and large the people who use 'em are pretentious assholes.