Is there a particular item or service you hope to find on OpenBazaar?
What makes Duo Search so important is the way users can distinguish between item listings. For example, users might look for physical goods, digital items, or even services. In the case of physical products, the condition will matter, as well as where the item is shipped from. Plus, some sellers offer free shipping, which is another important filter across the OpenBazaar protocol.
http://bitcoinist.net/duo-search-is-a-search-engine-for-openbazaar/