What to do with old clothes that are just laying around?

I have quite a bit of clothing laying around that I bought/was given and have either found it to be impractical for my daily adventures or they just don't work like I'd want them to. They don't look bad or worn out, in fact I feel a little guilty because some of the stuff has only been worn 1-5 times. I've managed to sell off some of the stuff to my friends and on ebay but I'm having trouble getting rid of the last few things. Any ideas on where I can get some money for it or donate it? I don't really care about how the stuff goes, I just would really like to get it out of my house and to someone who will actually use it.