Ah, my favourite time of the year, throw all your old junk in a pile outside and a big truck will pick it up. I've always taken advantage of these cleanups, and scored some pretty good stuff over the years. Never got an Amiga though, unfortunately. I've found:
A working Commodore 128D without keyboard (plays games fine)
A working Compaq iPaq (with a busted VGA connector though)
A Scart-S-Video/AV adapter, a couple of days after I just paid $15 for the exact same thing
8MB Apple RAM SIMM which works in my A1200 RAM card and accelerator
The base/wheels for an office chair to replace the broken base on my own chair
A working 51cm TV for the spare room
Some extra weights for my girlfriend so she can stay fit
A large plastic hemp plant, perfect for a prop in a short film (one of my hobbies is video)
Plenty of game cartridges for Atari 2600, Commodore 64, Sega Master System, Super Nintendo and Nintendo 64
Assorted game controllers, including a perfect condition CD32 pad!?!
A box of clothes for my girlfriend to wear
A lamp on a pole that blew the fuse in my house when I switched it on
A DVD remote for a PS2 Slim, which my little cousin needed and uses now
A box of ancient slides of Egypt, the pyramids and the Sphinx
A few sets of stickers from Guitar Hero boxes to put on my own guitar controllers
Some exercise equipment for my sister, they look more like rides but she reckons she feels the burn
I've found a bunch more over the years that I just can't pick off the top of my head. I've been pretty successful dumpster diving too, bringing home heaps of brand new stuff like solar powered garden lights, CD players, camping equipment, toys, ocky straps, stereo systems and other working stuff that didn't need to be thrown away in the dumpster. I believe in recycling, and I can't stand seeing all this stuff sent to the landfill when it could be used!