Ever since it nearly KO'd Blockbuster, Los Gatos, Calif.-based Netflix has become a hot commodity. In one year, its stock has tripled. It has taken on major cable companies like Time Warner and subscription content providers like HBO. It has successfully transitioned from being a DVD mailing company to a streaming content provider; all while surpassing 20 million subscribers.

Naturally, this kind of success inspired several rival services, the latest one from Amazon. Here is a breakdown of those who have taken aim at the streaming content king.