Many Bitcoin developers and investors, including some the most powerful Venture Capitalists of our day, have stated that Bitcoin's long-awaited "killer app" could be a decentralized marketplace that uses Bitcoin.
Open Bazaar may well be that marketplace, a peer to peer network that isn't controlled by any company or organization. Instead of visiting a website, you download and install a program on your computer that directly connects you to other people looking to buy and sell goods and services, and the only payment option is bitcoin. Earlier this year Union Square Ventures and Andreessen Horowitz gave the Open Bazaar developers US$1 million in funding.
http://bravenewcoin.com/news/sneak-peek-at-bitcoins-upcoming-killer-app-open-bazaar/
