Recommendations: Simple IM server for office LAN

[Dave Smith]

I want to setup a small IM server on my Linux box at work to quickly 
collaborate with other developers. I want to keep it simple:

    1. No authentication. Users just pick a user name, and they're in.
    2. Open standard so common IM clients can use it (mostly gaim/trillian)
    3. Easy install on Linux (I'm not afraid to ./configure; make; make 
install)
    4. Sane config (I just got done doing XML situps with jabberd2 -- 
XML config sucks)

Any ideas?

--Dave