So what are you thinking? Verbal interfaces like those on Star Trek? Brainwaves? Something else?

This video, posted in August 2006, shows some interesting UI work: http://www.youtube.com/watch?v=UcKqyn-gUbY. Some of this stuff seems to be included in the iPhone (I think - I don't own one). The presenter shows a full QWERTY keyboard on the multitouch screen but I don't believe that this will ever take off - tactile feedback is a key component of the keyboard interface.

Is there particular research or literature on this topic that you're reading?

Brad: You asked in another post for feedback on the comment functionality. I don't know how your response ot Oscar appears to you, but for me. it's displayed as white text on a light grey background. It's rather difficult to read.