sensitive sensing

the online version of a book on physical computing which is really useful for artists/creators: http://itp.nyu.edu/~dbo3/physical/physical.html ...of course, it's from ITP @ NYU.

What i'd really love to use is - the "people detector", which is basically an "Electric Field Proximity Sensor": http://www.bik.com/.

There's also a Wikipedia entry on sensors: http://en.wikipedia.org/wiki/Sensor