I like this thread idea. My community dump has a separate pile for electronics right next to where you drop off the rest of your trash. Pickings are slim, mainly broken computers, VHS players, and CRT TVs and monitors. Sometimes good stuff appears though. My most recent acquisitions were a Panasonic ghetto blaster from the 80s (my 3 year-old son's introduction to cassette tapes is nigh) and a Yamaha Natural Sound receiver, which needs its pots cleaned but otherwise sounds promising.
I used to dumpster dive a fair bit, mostly at Future Shop. Functional cordless mice and keyboards seem to make their way into their garbage frequently, for whatever reason.