Read this interesting post from Donald Clark today on Andragogy versus Pedagogy: http://bdld.blogspot.com/. He differentiates the two similarly to the way I do -- under pedagogy the teacher makes all of the learning decisions, under andragogy the student is allowed to make at least some of the decisions.
Have you done anything in your classes to move them along the spectrum towards andragogy? Do your students get to make any choices about projects, time lines, readings, etc? If not, why not? Is there a way to give them some control and thus responsibility over their learning?