Probably an over-summary but basically correct: the X series optimised portability and only had a trackpoint, while the T series optimised fully-featuredness an

Probably an over-summary but basically correct: the X series optimised portability and only had a trackpoint, while the T series optimised fully-featuredness and had both trackpoint and trackpad. I still fire up my T61 from time to time -- it's the only computer in the house that still has a DVD drive.