I upgraded my old laptop to 1.5 a while ago, and while 

Protocol "wsmouse"
Device "/dev/wsmouse0"

works fine for using the "nipple" on the keyboard, I've had no joy
getting a serial mouse to work.

When it was running 1.4, I used BusMouse, but that doesn't seem to do
the deed now.  Running cat /dev/tty00 suggests that the mouse works,
(its an old microsoft 2 button one) so if someone could tell me what
I should have in XF86Config I'd appreciate it.

--sjg