Surplus Engineering is all about taking things that are already manufactured (surplus), and engineering them into something useful. Ideas for projects and sources for materials are encouraged to be shared!
http://www.reddit.com/r/SurplusEngineering/
hope its ok to post it here, I've heard paul mention reddit and I guess he talked me into it. (I've found it's much cooler after you remove some the default subreddits by setting up an account in 5 seconds.)