Where to Donate Your Stuff: 101 Places Your Clutter Can Do Good

"Something that's been sitting in your house, unused and unloved, may bring a great deal of joy to, or fill the genuine need of, someone else. Make their day, and give yourself a pat on the back. Knowing that you're doing good can make it much easier to part with your stuff."

And don't forget these guys: Adopt-a-horse here or here