Kodak's Zi8

From DSC:
Jay Cross’s posting on this reminded me of some physics professors who were using this exact same camera to capture their lectures. It does an amazing job! From 25 feet back I could read every single item on a 16′ chalkboard — including all formulas, graphs, etc.

The only key downside is that the resulting file sizes are enormous. Any given lecture is around 2 GB in size. Whew!