The way it works is, you post something you want to get rid of, and someone else wants it and you arrange for them to pick it up. Or you post something you want, and someone else has it and wanted to get rid of it and you go pick it up. Etc. So far I got rid of an oddly-behaving boombox and a full-size metal bed frame by the first method, and a stack o' potty seats by the second.
But the best? Last weekend my area Freecycle had its first seasonal "Free-For-All": spread your stuff out on the ground and then go scout everyone else's stuff. No cash, no bartering, just take what you want provided you brought something. I scored a bedside carafe (with the little glass that covers the top) a food scale (much needed in this new regime of carb-counting) and--drumroll--
matching shabby chic light fixtures, painted metal floral chandeliers, one big and one small, to replace the one big and one small hideous teak-brass-and-giant-light-bulb seventies fixtures in my bedroom. Hooray!