Future Ben

So interfaces with EEG have been around for a while. But since the technology to make and analyze EEGs are getting it was time somebody did something inane with it.
From ReadWriteWeb

Technically, what Wilson did was come up with an interface combining an Electroencephalogram, or brain wave monitor, with an on screen keyboard for selecting letters. The system lights up each key on the keyboard but is able to notice a difference in brain activity when the desired letter for input is lit. Wilson compares it to clicking through multiple letters when texting on a mobile phone.

Once you’ve found a new way to input text - what are you going to do with it? Use it to Twitter, of course!

Clearly hooking stuff up to your brain is awesome and using it for some Web2.0 action is hip. But a lot of other fine work has been done.
Eva Lee Creates literal emotional landscapes in video using EEGs of volunteers. Not a direct harnessing of the EEG, but with a deeper meaning perhaps.

Also EEG has been explored as an interface for music

EEG is not the most elegant method our there, but it is less bulky than fMRI or EMG. Until we have cheap room temperature micro SQUIDs Expect to see continued experimentation for low bandwidth applications.