I have thought of things like this in the past, and it looks like someone has taken the time to actually do it:
http://www.gizmag.com/go/7293/
I think that they have gone down the wrong road for the mouse part though…

[ I chose not to make the reasons why it is not appropriate and what can be done to remedy it to be private, since this is a bladdy good idea.  Anyone interested, please email me. ]