Don't know what your looking for, but these two look decent.
http://www.diyphotography.net/diy_hi...graphy_at_home
and
http://www.hiviz.com/index.html
buliding a sound trigger
http://photography-on-the.net/forum/...d.php?t=211988
Video for a DYI contact trigger - music sucks, but it is simple to make and it works.
http://www.vimeo.com/865808/