e.g. Thinkpad T60p - very well supported.

The USB and network ports on the dock all work fine, and I haven't installed any drive into
the dock's multi-drive bay yet. (It will probably be an extra hard drive eventually, though -
the laptop already has a DVD drive.) There is no PC Card on the dock because there's one on
the laptop already, but that works too and currently has an Audigy2 ZS Notebook card in it.
The microphone for this Audigy2 card does not work, but that's apparently a known ALSA bug
rather than a laptop problem.

So far, I have only needed to dock and undock "cold", but doing so "hot" looks to be a matter
of turning a key, pressing a button and then pressing a second "eject" button when a light
turns green. I have not tried this yet, because I haven't needed to.