We've seen this in the brick and mortar world quite often. A store opens on a block and immediately grabs up all of the business in the area. Another company sees the profits and wants in to that location. Soon, more stores open and prices drop due to competition leaving the consumer as the winner. That resembles what is happening with the Android Market as Amazon is planning on opening its own OS-wide application store later this year. Right now, the retailer is accepting registrations and submissions from developers.
Unlike some other Android Market challengers like Verizon's VCast Store which is limited to Big Red's models, Amazon's marketplace will be available for all Android handsets. If you are a developer you can open your account and submit your app by clicking on this link