SL IRC channels and other chat things

There's the #secondlife channel, and #libsl, #opensim, #opensl.

I recall an LSL IRC channel being in existence but can't find it.

What other SL IRC channels are there?

Are there any other SL related chat rooms, msn groups, and other similar things?

I know of some Yahoo SL groups, but they don't seem like chat rooms to me, they have forums or mailing lists, so far as I can tell. There's SL facebook groups, and SL ning groups, and various other such things, but they also don't quit fit as chat rooms.