I've gotten really good at letting things go in the last couple of years. It's freeing! I used to think, "But I paid for it!" Then I realized that whether or not I paid for it, I wasn't going to use it, so it really wasn't costing me any more to give away.
What I don't like goes on the "free to take" table at guild meetings. If it doesn't get taken there, I give it to a charity thrift or a Mennonite group that makes comforts from all sorts of things. Out of my way and on to somebody who wants it!