OS 10.2.6; iBook 700; connected directly all last night static ip via com 21 cable modem capped at 1 Mbit/sec up and down, with the firewall off.
Currently back behind the LinkSys BEFSR 41 v2 router updated with the latest firmware, and trying Limewire 3.1.0/jum168.
Connections are pretty sparse (popular content only returns one result from a 192.*.* red host), probably because of the few connections and running as an UP.
A few uploads are completing and hits are coming through. I haven't been trying very hard to download anything.

I did do a completely clean install for the 3.1.0 version (trashed all the prefs so I could note any set-up/config oddities). Previous versions connected easily as a leaf.

I installed on the G4 iMac and saw similar behaviour, so stopped trying to check out user pref issues. My ISP says all should be good, so I'm trying to get in touch with a neighbour who hasn't updated.

Thanks Adam, and good to hear from you again trap_jaw
btw--I did try replacing the gnutella.net file from one I'd backed up from about LW 2.9.8.