A new project somewhere—readers, can you fill us in if you know—allows two users to type in a computer screen using only the power of their minds. The participants, Heath Ledger and some lady, are navigating possible letters by just thinking about the choices.

Interesting research if we can develop this further. At the level they're at right now, simple eye-recognition would accomplish the same thing much faster.

Brain-Computer Typing Interface [TechEBlog]