You can sell your domain names basically anywhere as long as you can find interested buyers for them. • Digitalpoint (here, BST section » Domains, but you'll need 25 posts minimum) • Namepros • Cax.com (if you're willing to spend that $10 on membership) • Twitter (yes.. :x) • Build your own portfolio site • List them on Sedo etc. I'm also on the way to create my very own Domain marketplace for the public, subscribe to Neptuni.com if interested. ☺