I've been given a large aluminium coldframe, a huge amount of greenhouse glass (maybe 40 pieces?), a lot of pots, a water butt and stand, and a, 8' by 10' or 12' (no good at estimating sizes!) Alton greenhouse.
I've freecycled a double pram, a cabin bed, some ikea office furniture, and a mountain bike.
It's a brilliant site!