I've blogged about this before but seriously, this is my favorite thing (besides ebay of course)
It is called Like Twice
You just sign up and request a bag. You fill up the bag with your gently used clothes and they paypal you money or give you a store credit to shop in their store!
I've done this three times already with my clothes that just did not sell on ebay due to their lineage. This stuff was from GAP, J.CREW, Bloomingdales, etc. This type of stuff does not have a huge sell through rate on ebay so I was happy to get anything for the stuff. (The next stop was goodwill).
I just sent in a few things again and my paypal account is $50 richer.
I've made over $200 in the past few months doing this so
it is a good reason to clean out your closet.
Here is the link if you are interested