Hm.. I went the Mac route because I've been using windows for a long while and I am so totally done with it. My previous laptop managed to ruin my mood most of the time. I use my laptop alot, and it's really annoying having to struggle with a slow OS (XP) and slow programs and both manage to crash up on you all the time. I maintained that Dull laptop quite well and it still didn't fit my needs anymore.
My brother purchased a MacBook (white older version) somewhere last year and the times he visited he always was quite delirious about it, so I asked him to take it with him about two weeks ago. I was already in love with the design before that. Well after having played with it for about 2 minutes, I already made up my mind and decided to sell off my Dull and get a MacBook. I originally wanted to go with the new nVidia White MacBook, but decided that I use my laptop enough to justify the additional €250 for the unibody.
I've got it for just over a week now and I'm totally digging it. Everything works just SO much faster and smoother. Of course it isn't perfect (it's close though ;-P) but it just works. Even though the specs might be a bit worse compared to windows systems, the superior design is enough reason for me to cope with it. (oh yeah and Os X aswell of course).
Having a super slick notebook, which is really fast, which comes with working software (osx/ilife) out of the box, doesn't make any noise, never gets really hot is more than enough reason to justify the additional expenses.