Hahaha, well of the top of my head how about 15" and 17" screens, Aluminum body, faster processors, better graphics card, express card slot, multi-touch, better speakers, backlit keyboard, extra USB 2.0 port, DVI output, FireWire 800, can drive a 30" Cinema...
ok fair enough
the screen size : I agree
aluminium : the new macbooks WILL have aluminium (so it doesnt count)
faster processors : yes, you can upgrade, but the low end is the same like the macbooks
better graphic cards : yes
express card slot : who cares, really???
multi touch :the new macbooks will have something similar
better speakers: for 2k machines theyre not that great, are they
backlit keybord : the new macbooks will have it probably
extra usb :-_- cmon you have to pay an additional grand to have it
fw 800 :fine
30inch :fine
So my conclusion, by paying 550$ more, thats what you get
15 inch screen size, better graphics, express card slot, thats pretty much it (if we take in consideration that the new macbooks will have some of the above)
On the low side, you loose 50gb hard drive and 550$ from your pocket
(plus, if you wanna get the Apple care, add 100$), etc, etc.
Up to you to decide if its worth it