I agree with Vivi in that if you want something for gaming that's gonna be really good, I'd have a desktop specifically for that and then have a laptop for other stuff. Many laptops just aren't suited for gaming -- as mentioned before, overheating and the short battery life are major issues. Heck, I'd just make my own desktop, at that point.

That said, I have the new 15" MacBook Pro. It has a 2.8 GHz Intel Core 2 Duo processor, 4 GBs of memory, and a 320 GB hard drive. Also, backlit keyboard ftw. Got it all for around three grand. Oh, Apple.

Now. I have both the Sims 3 and WoW on here, running on OSX.5. The battery life isn't terribly horrendous, but it doesn't much matter to me since I always plug in while gaming anyway. Overheating used to be an issue to where I would start seeing changes in graphics, freak out, turn the game off and let it cool for a while. Then I did a little research and found a program called "SMC Fan Control". It's basically my savior. It runs in the background, and you can set up different unique settings for how fast the fans are running depending on what you're doing. It keeps everything in check nicely, from my experience. Also, I have one of those lap fan things that plug into your USB port. That helps quite a bit too, since I like to curl up on my couch and play on my lap or on the cushions. (Yeah, yeah, stupid, I know.)

I haven't had Windows since XP, and I do miss it and plan on dual booting soon, perhaps trying out Windows 7. Too many of my friends have had bad experiences with Vista to where I'm just skipping over it (although with them, I do admit it's probably 98% user errors).

So, For those with attention deficiency disorders, here is a summarized snippet of the general ramblings for you to ponder over -, I like Windows. I like Mac. I like Windows on a Mac. And as long as you can tweak your settings, gaming isn't too bad on a Mac no matter which OS you run.