[AnIdiotOnTheNet]

There's also stuff like this: https://en.wikipedia.org/wiki/Projection_keyboard

[yjftsjthsd-h]

Those are sweet, but suffer from many of the issues of touchscreen keyboards (no tactile feedback, no ability to feel the keys blindly).

EDIT: But to be clear, they are great at having a full-size keyboard that takes up no screen space. Tradeoffs.