Hi Pete,
I got a MacBook (an Apple Macintosh laptop computer) about a month ago - and I also installed Windows XP on it too! (Using something called "BootCamp" which you can download for free... But you have to buy Windows separately.) This means you have both the Macintosh OS X operating system, as well as Windows - you choose which one you want to use when you "boot up".
I quite like the Mac (very nice looking machine and operating system) - but I'm also glad I have Windows too because I have a lot of Windows software that I use...
I think I still have the "new gadget" excitement factor with this, so keeping that in mind I'll have to go with Mac/Windows XP...
- Dien