I used Freecycle to get rid of some bedroom furniture when I was moving from Nebraska to California. It just wouldn't be sustainable to transport a bunch of crappy furniture across the country, would it? I couldn't believe how quickly people responded to my ad - my stuff was claimed in 5 minutes and gone in a day. San Francisco has a much more convenient version of Freecycle, though: it's called "leave your stuff on the corner and it will be gone in 2 hours."
David's keywords: free, landfills, furniture