There's this idea I've had for a while, but never got around to implementing: every namespace is a market. So there should be a place where you can trade ownership of tokens in different namespaces. There already exists a healthy market for domain names, although it is heavily fragmented, but usernames on websites are becoming valuable enough that it makes sense to trade usernames as well. Once such an infrastructure exists, you can imagine auctioning a variety of things this way -- phone numbers, license plates..

I've fleshed out the idea in my head in some detail, but that's the gist of it.