I'm using a T60 right now. Love the keyboard feel, I enjoy a 4:3 resolution too.
Can anyone recommend a newer laptop with a nice keyboard? I find all new laptops keyboards feel like a flat piece of plastic.
The MNT Reform 2 has a mechanical keyboard with a nice feel (and it's using off-the-shelf switches so you can replace them if you'd prefer), but it has a weird layout.
The most recent laptops with an actual nice Thinkpad keyboard were X220 or T420, everything after that is chiclets.
You can also mod an X230 or a T430 with a xx20 keyboard, which is worth it as the CPU/GPU and USB ports are all a decent upgrade. You need to flash the embedded controller though, to remap the keys - also worth it, to use a third-party battery. The process is not too difficult, you just need to compile the stuff, make a bootable flash drive, and boot from it - no soldering etc.