I used to own an IBM ThinkPad 600x.
What I loved:
Built like a tank
Black business look with no frills or gimmicks.
Super-strong screen hinges. I hate laptops on which the screens wobble around when you type (just the epitome of cheapness ... and it drives me nuts).
Full-size, solid keyboard with a proper layout (ins/hom/pg/del/end key cluster is in the proper place, extremely important for programming), even though it was a 13.3"
TrackPoint. I will never buy a laptop...