Last fall I did a major cleanup of my apartment. I trashed things that weren't useable by anyone (damaged, too worn, etc.). I recycled everything that could be recycled. Everything else that I got rid of went to Goodwill. If you don't care about the money, thrift stores are great places to take your unwanted stuff (clothes and furniture in my case). If you have books in good repair, your local library may take donations. If not them, then a local used bookstore.