Finally found ThinkPad List of Products wiki with wealth of info–start with its first arrival in 1992 (thanks to Mas Pri posting). From that page I got the official ThinkPad History at IBM’s page (now Lenovo’s).
I’ve been admiring IBM ThinkPad since I touched its 345D version. It was very tough and rigid (remebered that I was tried to fix its CD-ROM tray that won’t closed. From that experience I become known of what’s composing a notebook). And then I found 600D that become my first Debian installation–though it failed.

On August 2004 I bought myself second-hand T21 and installing Ubuntu Hoary (now Breezy) in it. And my pursuing of ThinkPad will continue to either T41 or Z60T series. Wish me luck! ;-)

[OMG my English! What am I trying to say here!? :-( ]