Most laptop trackpads still use PS/2 to communicate. I hear that trackpoints usually do too.
The 11900 trackpad is either alps or cirque (alps) PS/2, they are somewhat low DPI but otherwise nice.
Most people like synaptics, and they usually have excellent driver support. I would recommedn them. Or just get an old laptop.
I actually have a spare synaptics PS/2 trackpad from 2007 in my "spare parts" laptop (spilled in MB no longer works) You can have it for $shipping if you want.