I recently found a program called PeerGuardian
(http://phoenixlabs.org/pg2/) that blocks certain IP's and ranges of
IP's from communicating my computer.

I was thinking it would be great if I could feed m0n0wall the same
list, or something similar, to prevent any traffic from the listed
IP's.  This way I could protect my whole network in one central
location, instead of having to install this application on each
workstation.

Is this possible?