An article on CNN (although this has been posted by several web sources recently) titled 'Surfing the Web with nothing but brainwaves' discusses the recent developments in producing brain chips that can interface directly with computers without the need for any cables, etc:
"Already, the Brown researchers say, this kind of technology can enable a hooked-up human to write at 15 words a minute - half as fast as the average person writes by hand. Remember, though, that silicon-based technology typically doubles in capacity every two years.
So if improved hardware is all it takes to speed up the device, Cyberkinetics' chip could be able to process thoughts as fast as speech - 110 to 170 words per minute - by 2012. Imagine issuing commands to a computer as quickly as you could talk."
The article also contains a link to a demonstration video.
By the way, this post was written directly from my mind...