User-friendly names that map to GUIDs have several benefits in the development of a web-of-trust for reputation based in commerce (as put forth by Dionysis: https://gist.github.com/dionyziz/e3b296861175e0ebea4b#pseudonymity). For example, to access specific stores, users send around their GUIDs (as can be seen here: http://www.reddit.com/r/BazaarMarkets/comments/2fjui8/selling_google_glass/). It's easier to remember reputable stores by their user-friendly names.
Here's a proposal to implement such a user-friendly system in OpenBazaar that is acceptably (debatable) decentralized using the Namecoin blockchain (http://namecoin.info/) & DNSChain (https://github.com/okTurtles/dnschain) model & server tools.
Namecoin + DNSChain + OpenBazaar GUIDs.
Namecoin is a decentralized key-value store using blockchain technology. It's been used to map decentralized domains (using .bit) & identities (using namespaces such id or u: https://github.com/opennamesystem/openspecs) amongst other uses. It is the m