i have a reason. Did you read the Dell thread? People complaining about repair issues and tech support. Doesn't happen with a Mac. On the rare occurrence you need help, just call them. No hassle no headache. If you have a local apple store just make an appointment and they will help you. Everything will be completely free if you are under warranty or have extended care. After that you pretty much just pay for parts. You could even make an appointment to learn how to use a program they support. With a Pro Care card, they will do FREE 1-on-1 training as well as front of the line tech support.
Once I had a problem with my mouse (what is it about their mice). I walked into the store, cut the entire service line w/my ProCare card and walked out less than 5 min later with a new mouse.
The new Intel Core Duo chips, now standard in ALL Macs, will run both Windows and Mac OSX using a beta program called Boot Camp. NO ONE I know running Boot Camp has had any issues. Boot Camp will be a full part of OSXI which will be the new operating system for the Core Duo chip.
Dell sells systems with the same processor so I don't know why anyone thinks running Windows would be a problem.
Wireless networking, a webcam, speakers, bluetooth, all built in and not extras like you would have to buy with a company like Dell. And with a service like (dot)Mac you get seamless email and web-hosting for websites, podcasts, photocasts and video.
The biggest issue for me would be software compatibility and cost. I haven't run into a huge problem YET but it could be a huge issue. Where I have run into a problem is with freeware. There just isn't much Mac shareware or freeware. Like someone else pointed out sometimes website applications aren't Safari compatible but they are almost all Firefox compatible and that is a free download.
I love everything about my Mac. DS still has a PC for his game but it has completely crashed twice in just over 2 years. The first time, under warranty, we had it fixed but now we are just going to by a new cheap PC. I will give him my iMac when OSXI comes out and I buy a laptop.