Here's a great resource that's starting to take off like crazy in the classroom. It's been tried and tested on many sites in the Atlanta, San Fransisco, and Washington DC area with great success.
http://www.ontheconstructionsite.com
English On The Construction Site
Moderators: Dimitris, maneki neko2, Lorikeet, Enrico Palazzo, superpeach, cecil2, Mr. Kalgukshi2