I know a lot of people are extremely fond of Craig's List, but I've found Freecycle to be as good as, or even better than, CL when it comes to finding a new home for stuff. The 'catch' is, you can't get cash for your stuff. You have to give it away. I suppose it's deeply "hippie dippy Californian" but it works.
Goodwill is excellent for rehoming many things (plus you get a nice tax deduction), but there's some stuff they don't take. Moving boxes, for example. I hate throwing perfectly good (and not inexpensive) boxes away when a move is done. Twice now I've tried posting ads on CL to get rid of our boxes after a move, and didn't get any takers. Today, in less than three hours, I found a willing taker for all our extra boxes on Freecycle. And the nice guy who took them promised to Freecycle the boxes in his turn after his move was done. So, the boxes get reused, I feel good and get some space in my living room back. All is well.
If you've got some stuff you don't want to just throw away, and can't find a new home for it on your own, take a look at Freecycle.
