Amazon Fire TV?
Amazon announced today their Amazon's TV set top box. It appears to be a decent competitor for another IP streaming box, assuming one has a strong Internet connection.
Forum Discussion
My guess is that its no better or worse than a Roku or Google Chromecast. The trouble is that despite the advertising, there is really a limited amount of popular shows and movies that the content owners allow to be streamed though a service that changes a monthly service fee. To get the "good stuff" you either have to rent the physical media or pay a per use fee.
