Here are some things you could use the Logitech K800 keyboard for: Mood lighting. Night light. (Weak) torch. Mosquito swatter. Night frisbee. Oh, and typing, I guess.
Using ambient light and motion sensors, the K800 is a wireless, backlit keyboard that could be great for Media Center PCs, if anybody used Media Center PCs these days. It's expected to hit Aussie stores in early October with an RRP of $180.