I've already sung the praises of using student response systems (clickers) as a really effective teaching tool.
I know you don't believe me. I didn't believe the "true believers" either . . . for a while. But eventually I "got it" and well . . . forgive me . . . I'm now a missionary for the cause.
Want to hear my "testimony" . . . even if it's just to knock holes in it?
i>clicker, the company that makes the system that I use, has recently published my case at their website . . . along with testimonials from other biology faculty (and faculty across many disciplines).
Check out My clicker case at my The Electronic Professor blog for an intro to my case . . . and the link to find it.