The Epoc Mind Reading Helmet from Emotiv should be available in the US and the UK from early 2008 capable of reading what wearers are thinking. Initially to be launched for Gamers controling their characters the implications are massive, opening the possiility that one day soon people will be able to control the cursor on their computer by simply thinking about it.
Emotiv Epoc Mindreading Helemt demo video on YouTube
The Emotiv web page for their Epoc Project.
The London Times has details the Epoc Mind Reading Helmet together with some interesting thoughts as to future applications.