here is a FAQ on dumpster diving that i was linked to, when i was inquiring about it not too long ago. i'm sure there are other ones, probably better written too; if anybody knows of a better one, i dont see why linking wouldnt be allowed. PhreeX wrote a really good faq on dumpster diving at pharmacies, but its been lost in the flow of time (if anybody has it though, i'd much appreciate if you'd send it to me!).
i havent gone out dumpster diving yet, as i'm a bit hesitant like i am about doing anything new, unknown, and unusual by myself, but i've been seriously considering it for a while. also, one of the few things keeping me from hitchhiking across the country is the lack of money for food, and dumpster diving sounds like the best solution to this problem.
most people have probably been driving past somebody's trash or dumpster and stopped to take something that was openly sitting out and in good condition, such as furniture, but thats not really dumpster diving imo. dumpster diving would be if you intentionally go out looking for stuff in the trash.
if i can work up the courage, or find somebody to go with me, i'll probably start diving just as soon as it starts warming up.