Thanks for that link. It looks about at my level so I'll have a read tonight. I am on 10.6.8
Here's what I got back from the command you suggested (looks like all of these are just ports starting with "53" - confirming that DNS is not running?)
mDNSRespo 36 _mdnsresponder 8u IPv4 0xffffff800fe25980 0t0 UDP *:5353
mDNSRespo 36 _mdnsresponder 9u IPv6 0xffffff800fe25840 0t0 UDP *:5353
mDNSRespo 36 _mdnsresponder 50u IPv4 0xffffff8012030c00 0t0 UDP *:53697
mDNSRespo 36 _mdnsresponder 51u IPv6 0xffffff8012030340 0t0 UDP *:53697
Python 50 _jabber 4u IPv4 0xffffff8012cc4da8 0t0 TCP localhost:49277->localhost:5347 (ESTABLISHED)
Python 75 _jabber 3u IPv4 0xffffff8010120a08 0t0 TCP localhost:49177->localhost:5347 (ESTABLISHED)
resolver 406 _jabber 4u IPv4 0xffffff8012970418 0t0 TCP localhost:49172->localhost:5347 (ESTABLISHED)
sm 407 _jabber 5u IPv4 0xffffff80129727b8 0t0 TCP localhost:49170->localhost:5347 (ESTABLISHED)
router 408 _jabber 4u IPv4 0xffffff80127621c8 0t0 TCP localhost:5347 (LISTEN)
router 408 _jabber 5u IPv4 0xffffff80127615e8 0t0 TCP localhost:5347->localhost:49166 (ESTABLISHED)
router 408 _jabber 6u IPv4 0xffffff8012760a08 0t0 TCP localhost:5347->localhost:49167 (ESTABLISHED)
router 408 _jabber 7u IPv4 0xffffff80127627b8 0t0 TCP localhost:5347->localhost:49168 (ESTABLISHED)
router 408 _jabber 8u IPv4 0xffffff80129721c8 0t0 TCP localhost:5347->localhost:49170 (ESTABLISHED)
router 408 _jabber 9u IPv4 0xffffff8012abfda8 0t0 TCP localhost:5347->localhost:49172 (ESTABLISHED)
router 408 _jabber 10u IPv4 0xffffff8012abe5e8 0t0 TCP localhost:5347->localhost:49177 (ESTABLISHED)
router 408 _jabber 11u IPv4 0xffffff8012cc47b8 0t0 TCP localhost:5347->localhost:49277 (ESTABLISHED)
c2s 409 _jabber 4u IPv4 0xffffff8012760ff8 0t0 TCP localhost:49167->localhost:5347 (ESTABLISHED)
mu-confer 410 _jabber 6u IPv4 0xffffff8011d14a08 0t0 TCP localhost:49168->localhost:5347 (ESTABLISHED)
s2s 411 _jabber 4u IPv4 0xffffff8012761bd8 0t0 TCP localhost:49166->localhost:5347 (ESTABLISHED)