Although I don't have the quite the same opportunities here as this chap does in Montreal, it's got me thinking about the contents of GBT many of which have come to me via freecycle, friends and family. The balance between new and used tipped in favour of the latter years ago.
Specific examples which were destined for landfill are an interior door complete with puppy gnawed edges no less that Mr GBT filled and then painted, our stainless steel kitchen sink again intended for a skip and more recently our kitchen bin that I found abandoned near some dustbins locally. Once everything had been cleaned up it was all found to be in excellent condition.
Personally I think it's important to keep the circle of reuse closed so we too move our unwanted items on to those who can make use of them. The latest in this category was our lawnmower....having dug up the grass and replaced it with gravel it was taking up valuable space in our garage.