There is the lojban IRC on freenode, as far as I can tell it's the main online conversation in and around lojban. Our most recent stats have 371 lines in lojban over 32 nicks.
http://jbotcan.org/logs/lojban-thismonth.html We occasionally talk online using mumble, but this is ad-hoc. I believe the phone group is still theoretically active, and I'm sure someone will post about that. We have the picture boards at
jbotcan.org. People are expanding into youtube vids.
A lot of the active jbopre are linux users, and agree that the 2nd life client for linux is bad. So is google's attempt. We'll probably stick to IRC for now.
In the real world there is the yearly logfest, and the German lojbanists are meeting within another meeting. British lojbanists are arranging meetings in all you can eat restaurants.
mu'o mi'e cmacis