Apples are great (especially since they never get all those viruses that constantly crash college computers on the network), but I'd find out which computer os your school mainly uses (most colleges have some kind of deal with certain models, for instance, my undergrad was configured for iMacs and Dells), and its often cheaper to buy your computer through the school. If you do that, many schools will service your computer for free (my grad school will even fix/replace broken iPods for free if you buy them through the school).

Other essentials:

Mini Fridge
Britta (most water at college sucks)
Lots of Ramen
Iron
Quarters, quarters, quarters (unless you want to quarter whore)
Cinder Blocks (Or something else to loft your bed with so you can store things underneath it)
Plastic Tubs to store things in
Sticky Hooks
Lightbulbs
A hammer, screwdriver, and nails
EXTENSION CORDS
Control Strips that let you plug a million things into one socket
PENCIL SHARPENER
Stapler
Crates or stackable shelves
A TV with a crazy antenna (to try to get the one station that comes in)
Shot glasses
Dry Erase Board
Christmas Lights (no college room exists without them in my experience)
Tissues
Frabreeze
A spounge
A vacumn or carpet sweeper
A carpet (if you have wood floors)
White toothpaste (to stick in all the holes you're gonna make in your walls)

And as much free stuff as you can carry away from home. Every time I go home to visit I steal shampoo, quarters, Tylenol, and a million other little things I can't afford to buy.