Hee, I have downloaded a crapload of courses from MIT courseware for my Uni project and that was one of them. :D

I've seen the first lecture, but that was mostly administrativia...so I can't really say anything about how hard it is. But I really like the lecturers and they were like "You can have too much knowledge for this class, you can't have too little." ♥

I would definitely be interested going through the class together! I may be jumping ahead, depending on what I need for University. But I would definitely come back to do it again. I know I'll need it. ;)