Russian Art.Lebedev Studio's have created a keyboard where each key has its own tiny video screen, i.e. the symbols on the keys can be changed to show different languages or symbols at a stroke.
Every single key of the Moscow-based company's all-purpose Optimus keyboard is a 32 times 32 pixel OLED display.Check it out! I gotta get me one of these! ^_^
UPDATE: After years of postponing, it looks like this keyboard is finally coming to fruition. There's now a countdown to when they start taking orders on the website. But be warned, the price tag is enough to deter all but the most determined and economically well-off.