Jabber at me on chewtoy@s8n.net
If you don't already have Jabber, then feel free to register an account on im.s8n.net. It's available unsecure on 5222 or secure on 5223. It has user directory; conferencing and AIM, ICQ and MSN transports enabled.
If you don't know what I just said, try the FAQs at jabber.org.