So far there's a few forums for these new online classes, like the AIqus site[0], Udacity forums for CS 101[1] and CS 373[2], and a lot of IRC channels, the main hubs being at #free-class, #udacity, and #mitx on irc.freenode.net[3].

There's individual channels for each course as well, for Coursera courses they follow the pattern of the class url preceded by an octothorpe, so for the Design and Analysis of Algorithms I class at http://algo-class.org for example, the IRC channel for it is #algo-class. For the Udacity courses, they follow the pattern of ##udacity-<course number>, so for example ##udacity-cs101 and ##udacity-cs373

[0] http://www.aiqus.com/

[1] http://www.udacity-forums.com/cs101/

[2] http://www.udacity-forums.com/cs373/

[3] http://webchat.freenode.net