Just found this url on the ITP list. This is a great idea. In short, donate your items, sell, and receive a tax receipt.

http://www.webthriftstore.com/

Also, check out Housingworks and Angel Thrift Shop if in NYC, or Housingworks digital space.

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Having trouble holding onto stuff you don't need?

"Do you have a closet full of clothes just taking up valuable real estate that are so old you can't even remember where you got them?"

Maybe this post can help you from one of my favorite blogs, Apartment Therapy. I love this competition on designing "Small," "Little," "Tiny," and the most challenging "Teeny-tiny" spaces:
http://community.apartmenttherapy.com/contests/smallcool/2011

Referencing Doria Fan and Hilary Spencer for introduction to "Apartment Therapy."