This Friday, A new website called NextWeb.com will be launching to purchase and/or sell gently used, or new wedding items including Bridesmaid dresses!!
Via Heather the President, "If you have items you would like to post in advance of the launch, email pictures, descriptions and the price you want to sell it for to email@example.com . There is no fee to list your item. If you would like to list your item after the launch, you can do so by setting up an account and posting the item."
No need to let all of those wedding items collect dust around your home, sell them! Let us know how the site worked out for you.