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Check out this brain interface device It allows you to control your computer as fast as thought. It doesn't really read thoughts, so you have to do some training to prepare to use it, but it shows interesting possibility. Watching Star Trek, they talk to their computer, but wouldn't it be easier if you could just think to the computer? This device reads up to six ranges of alpha and beta brainwaves, plus eye and facial muscle movements, to allow a decent amount of control, but it isn't even a full keyboard yet, so it can't replace the keyboard and mouse just yet.
You have to use biofeedback to train your alpha and beta brainwaves to act like you want them to, the article says that they feel proficient after about a month, and compare it to learning to type on a keyboard. Anyway, it sounds interesting to me, but maybe not until it has been out a while, and gets cheaper than $300...