I just heard about this charity...for anyone who doesn't know what to do with their wedding dress and wants to donate to a good cause or for those of you getting married soon. (let's be honest, there's no hope of your future daughters wearing it and there's no need for it to sit in your closet).
http://bridesagainstbreastcancer.org/#donategown They take the dresses and sell them all over the country and the money goes to breast cancer. I'm definitely thinking about doing this after my wedding next year.