These days I use my company-issued MacBook Pro. It's amazing how small my 12" Powerbook seems in comparison. Sadly, it's no longer in an usable state. I'd still want to get a 12" (or smaller) MacBook Pro (if they ever make one): it's so easy to carry around.
FWIW, now I have more sticker space. :-)
Oh, here’s an useful post for you geek fashion n00bs (gosh, it almost feels retarded saying that) on how to (and how not to) accessorize the ultimate geek fashion accessory.