For the past couple of months I've been a beta tester on a very cool iPhone app that is now available in the app store. Poshmark is a marketplace for selling and buying clothes via other fashionistas around the world. It's super easy to list items with the in-app camera so you can make room in your closet for next season's trends and put some money back in your wallet. They even take care of the shipping with pre-paid, pre-addressed labels. Download the app today so we can start swapping clothes. Any size 9 shoe-wearers out there?