This page contains a list of various forums in which people discuss Lojban or discuss in Lojban.
There are locally stored archives of a number of lists, all of which can be signed up for at the lojban.org mailing list interface.
The Lojbanic Phone Group: arrange a real phone call (or Internet-based call) with another Lojban speaker at any skill level.
The Lojban Wiki has been the source of a huge amount of Lojbanic activity in the last few years, and is free for everyone to update and contribute to. Please come join us in creating a vast store of Lojbanic information, or just browse around and see what catches your eye.
Lojban IRC provides an informal meeting place for conversing quickly in Lojban. It is beginner-friendly, as well. The IRC channel can be reached by pointing your IRC program at irc.lojban.org.
There is now a web-based IRC client available.
Here is an IRC cheat sheet for people who are still learning Lojban.
Furthermore, thanks to help from Theodore Reed and Jordan DeLong, there are now public logs of the lojbanic portions of the IRC channel.
Note: the logs are filtered so that they contain only lojbanic text. However, you might still be offended by the things discussed there. If you are, that's your problem, and the LLG explicitly disclaims responsibility for anything said on the IRC channel, including by members or officers of the LLG.
Furthermore, no guarantee is made as to the correctness of the Lojban therein.
jboselkei is an online game of translation from English to Lojban, featuring rating calculation for users. If you don't know how this or that is translated to Lojban, ask it in jboselkei, and in 1-2 days expect seeing one or even more translations of your 'post' made by jboselkei players, with comments. If you are an experienced lojbanst, you will always find a couple or more challenging 'tough nuts' awaing your translation and promising rating points. jboselkei is very new, it appeared in mid March 2006. Playing in jboselkei is very excitable, you are welcome to join!
The Lojbanic Interactive Story is a web-based story writing forum. The story itself is all in Lojban. Anyone can add to it, please go contribute!