I found this article on Engadget today; the article is in two parts
and is from last year but I assume is still mostly relevant:

http://www.engadget.com/2005/08/23/how-to-control-csound-with-a-custom-midi-controller/
http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/

The author uses MacCsound in conjunction with MIDI and in the second
part some custom hardware.

Thought it might interest the list in case anyone missed it (like I did!)

steven