I've personally found 2 bikes in the trash that I've sold on CL for a combined total of $225 and I found a great Shimano RH540 rear wheel that I spent $20 on to have repaired, so I feel I am way ahead of the game. Lots of guys in the Classics/Vintage forum find neat stuff, the best being a guy last year who found a wasted Masi in a dumpster and he ebayed it for 500$USD. Here is a pic of my wheel:
There was a guy on this forum who found a sweet Miyata track bike in the garbage, here is the thread about that, pics are halfway down the page:
http://www.bikeforums.net/showthread...ghlight=miyata