Valve launched its Linux-based SteamOS a while ago, and now the operating system can be used with Microsoft's Xbox Elite Controller. There's a catch; it won't work with SteamOS in wireless mode. It has to be connected physically to the "Steam Machine" to work.
The support for the controller was added in the recently released 2.60 version of SteamOS. In addition, a beta version of the OS has added preliminary support for Bluetooth devices. The first official "Steam Machines" that have SteamOS pre-installed launched last fall from PC makers like Alienware, Syber and others. Valve also started selling its own Steam Controller and a Steam Link that can be used to stream games on a PC to a big screen TV. So far, neither Valve nor any of its partners have revealed sales figures for those devices.