Derekg, what a wonderful link!
I really like the idea. There are only two groups in the Netherlands at the moment, none of the close to where I live, but fortunately we have something like that in our building already; in the hallway downstairs there are some shelves where you can leave anything you don't need/want anymore, for people to take. It's a lovely way to get rid of clutter and disappointing cookies, and it's always exciting to see what's there!
Visitors have to be warned not to put down their umbrellas, hats or magazines there though.....;-)
Wouldn't it be wonderful if, say, supermarkets would just have a little table or something (next to the board with ads maybe) that works the same way? It would make things so much simpler.