There're more than that, over time anyway: http://tech.groups.yahoo.com/group/etjaynesstudy/

(Personally, my problem is that Jaynes is difficult, my calculus weak, and I have no particular application to study using it. It's like programming - you learn best trying to solve problems, not just trying to memorize what map is or whatever. Even though I have the book, I haven't gone past chapter 2.)