Roku just hit a milestone: over 10 million of its streaming players have been sold to this point, stretching from the companys original set-top box — which debuted in 2008 — through today. Its a big number, and it establishes Roku as one of the leading players in the living room, at least when it comes to streaming boxes. Game consoles obviously sell many more units than that, but Roku has carved out a nice audience by pricing its products aggressively and constantly expanding the ecosystem of apps that run on those boxes.