Ooh, looks nice .
It's my impression that the 600X is the model that would get the most votes in a "greatest Thinkpad ever made" poll (though the 701C, with its innovative "butterfly keyboard" is a serious contender). Having owned and used (up) a great number of different Thinkpads, the 600X would get my vote at least. The fact that they were made by IBM, who treated their workers with some measure of dignity, at a time when the floodgates to products made by slave labour had already been thrown wide open, only adds to the magic. The build quality lives up to its £2000 (not adjusted for inflation) price tag - if anything it feels like it must have cost even more; the mechanics are almost surreal, like some priceless gadget from a nuclear power station or a space ship. It also manages to get the size just right; at 13.3" it's wide enough to fit a full-size keyboard (and boy, what a keyboard!). and have enough room for an optical drive, and it's
just light enough at 2.3kg to remain transportable. Of course, the technical specifications are woeful by today's standards - a 650MHz PIII, a maximum of 576Mb RAM, just 4Mb graphics RAM, USB 1.1, PATA HDD interface, no HDMI or even DVI output, no built-in LAN or WiFi - but with a slim Windows 2000 installation (or some lightweight Linux distro) plus Firefox and VLC (and a network card of some sort) it would still be quite usable for 90% of the things I do on my laptop today. Which is quite remarkable, when you think about it.
Edit: It does have an internal Mini-PCI slot, which can be used to add a LAN or WiFi interface (maybe even an SSD?), as well as two CardBus slots. It is also possible to upgrade the (socketed) CPU, to a maximum of 850MHz, though these are extremely rare and hard to find.