I use the mousedev module to control my MS USB trackball, which uses the IMPS/2 protocol (which I think most modern MS mice use).  On my system (Debian), I just had to add an entry in /etc/modules for mousedev.o to load at boot time.  I don't use GPM (because I hate it :), but I'll put up a copy of my XF86Config file at http://bard.sytes.net/XF86Config-4.example.  I have both my touchpad and my trackball able to be used simultaneously in X.
Levi 
On Sun, 5 Jan 2003 17:46:25 -0800 (PST)
Daniel Noah <danielnoah@yahoo.com> wrote:
> I can get my scratch pad mouse to work but can not get my USB MS
> mouse to work in console (and thus Xwindows) mode.  Below are the
> contents from dmesg and the gpm file.  
> 
> Any thoughts on what I might try? 
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