Today all of my students (in two classes) simultaneously tried to post to a class wiki.  I think, all in all, things went rather well.  There were a few problems -- someone accidentally put their comment in the navigation bar -- but more comments were posted than not.  So that's a victory.

Next:  commenting and linking!  I'm looking forward to the time when more of my students discover they can comment directly on someone else's post (politely, in italics or different fonts), and that they can link to anything online from the wiki.  And at some point someone will figure out how to reformat the entire thing so that it looks a lot better.  Perhaps someone will want to do a podcast about each class and link to it from the wiki. 

We're on our way.  This is a good moment to point to AboutUs.org and the Wikipedia List of Wikis.