Amazon is developing a set-top box to stream video over the Internet via its Amazon Prime and Instant Video services, according to Bloomberg Businessweek. The box will compete with similar offerings like the Apple TV and the Roku, though both Microsoft's Xbox and Sony's Playstation have moved into the streaming video arena in recent years. The set-top box is being developed by Amazon’s Lab126 division, based in Cupertino (Calif.), which has toyed with building TV-connected devices for several years, the people familiar with the effort say. The project is being run by Malachy Moynihan, a former vice president of emerging video products at Cisco who worked on the networking company’s various consumer video initiatives. Mo