The TecPodium TCD-100 from Tecom Electronics allows a teacher to control a projector or flat-panel through a colorful remote with giant buttons, rather than the remote that ships with all projectors (usually with more than 20 small buttons). The TCD-100 has a built-in IR learner so it can be customized to control any display. It only has five buttons, includes MACRO functionality, is about the size of a business card and has a battery that lasts for years.
This is an interesting concept and a creative, simple product from TECOM. There are many hang-and-bang'ish installs where there is no control system and to control a room, the end user does end up using the projector's remote for not only switching inputs, but also for volume control. This simplifies it even more by offering those functionalities.