I tried installing NetBSD 3.0 as well, but it couldn't find any disks
  to install to.

In my T60, I set disk controller to legacy, which makes it look like
PIIX rather than AHCI.

  Doesn't work at all or barely: suspend/resume, WLAN, SD reader,
  fingerprint reader.

wlan is intel?  I have ath(4) in mine (ordered on purpose that way)
and it works fine.

Newer current (last month or so?) is better on the wm(4) but the PHY
programming is still off.  Perhaps that's your latency issue.

My experience on T60 is otherwise similar.
-- 
    Greg Troxel <gdt@ir.bbn.com>