Following the 2004 purchase of audience-re...

Following the 2004 purchase of audience-response maker EduCue, Columbia, Md.-based GTCO CalComp was able to expand its interactive offerings from just white boards to audience response as well. "It looked like a great complimentary product for us, and in fact they work great together," says Rob Meissner, the company's vice president of marketing.

InterWrite's latest version debuted this spring, but Meissner says the product first launched about six years ago. He says audience response is growing ever more popular, so much so that sales have been increasing at a rate of 100 percent annually, and now half a million clickers are in use.

Many of the company's clients are universities, but he says pharmaceutical companies also use them in training sessions, and the market continues to expand.