Order of lectures
Idea: Swap the NumPy lesson with one of the Wednesday lessons (IPython Notebook or matplotlib).
Reasoning: The Wednesday lessons are all a bit lighter on content and can probably do with a little less time. The Tuesday lessons are all quite hard and need their time, especially the NumPy lesson (which used to be two hours). Same goes for the assignments.
I don't think the IPython notebook or matplotlib lessons have any hard dependencies on NumPy. Either would be fine, but the new form of the matplotlib lesson uses IPython Notebook, so it would be most obvious to swap NumPy with IPython Notebook.
I guess it's too late for this year though.