> Hi all!
[snip]
> Where to go from here? I'm basically just wanting to test m0n0wall on
> PC hardware before getting a Soekris box or some such and this is
> *annoying*.

Have you tried the following on your m0n0 box? Go to 
http://ip.of.mono.box/exec.php and enter these two commands:

route delete default
route add default -interface -link dc0 (<- change dc0 into your wan ifc)

Q.