I find that I draw two forms of inspiration from my classes.
The first kind is usually a result of reading one of my history texts.  Since history is fascinating to me and absolutely full and over flowing with ideas about movers and shakers, cultures and people, that sort of inspiration usually results in a story idea leaping off the page and into a scribbled note in the margin.
The second source of inspiration is just as much fun. It’s the kind that comes from a desperate mind casting about for anything semi-legitimate to do besides study, and coming up with a really off the wall idea that must be written down immediately. Just now my class on the uses of rhetoric is filling this niche nicely. When I’m finished with it I’m sure my logic class will fill the void.