Jeff,
I really like the pace at which the lecture moves and I think they are good quality lectures. Two things I would change, and please don't take them personally:
1) I would add more detail to the slides. Some people are visual learners and seeing it will really help reinforce the material for those students. I'm not saying it should be a text book page, like some review courses, but maybe a touch more than what you currently have.
2) I would try to add some energy to your voice. To me, it sounds a bit nasally and mono tone.
B- 8/13/2012- 92
A- 7/19/2012- 83
R- 5/30/2012-82
F- 7/3/2012- 90