Sorry, I got slammed with paying work (imagine that?!) and some behind-the-scenes work for knowledgegarden.org, so I got further behind schedule on this. I am working on it, however, and am about halfway done. I'm trying to be careful about specifying interface details; it would be pretty embarassing to have a usability testing module that is difficult to use. I probably should learn not to make public promises of completion dates, but since I haven't quite learned yet, I'll say I'm going to try very, very hard to have it done by Friday.
BTW, I actually found somebody who has some formal training in usability testing; I'm going to try to entice her into giving us some feedback on the spec as soon as it is done.