It's a complaint about the lack of proper documentation of the Activity object, which is key to building courseware for programming anything more complex than "Hello, world!" in the Sugar environment.
I've been a year writing an Activity (StarChart) in Python/PyGTK that would have taken me about six weeks to make in Visual C++ for Windows. Chalk some of that up to not knowing any Python or anything about GTK. But mostly I've had to wait for somebody to say something (in the Sugar Almanac wiki subtree) about how to do very basic stuff inside the context of a class derived from Activity.
My current blocking problem: I need to detect a mouse click but I can't figure out what Widget is actually the correct one for connecting the event to.