I made a contact mic recently, and have been playing around with it.
Here is a dangling slinky:
Here is a 2 by 3 foot sheets of steel:
Hey, I used to have comments on this site, but nobody but spammers ever used them. So, please do get in touch with me via Flickr, Vimeo, Facebook, etc. and let me know what you are thinking. Or, email me.