Laptop is not needed. I'll be honest, everybody shows up with their laptops for the first week of class, then realizes that there is nothing you need it for. At KCOM we are given lecture notes, so there is no reason for it, unless the lecture has a ton of pictures (derm, histo, path), which makes it nice if you can have the PPT before hand.
I'd get a laptop, though, cause it makes life easier.
Hey, I have a Dell and I have never had a virus or a problem. Just because windows sucks doesn't mean you have to get sucked. By the way, I finally made the switch from windows to unix on my little ol' dell--Fedora Core 3. It sure is nice to get thousands of dollars of window$ software for free because of the open source crowd. Plus, I have a cool little app that has eyes that look to the direction of where my mouse is on the screen and I also get Wanda the fortune teller. Do you get that with Windows or Mac? I think not.
Back to the topic, get a laptop AND a desktop.