Games on Linux (Score 1)

A few questions: 1). Which is the preferred language for writing games on Linux? If your porting from Win32 and still want cross-platform (multiplayer, some files, etc.), then should it be the same language as that? 2). Is it possible to somehow imitate the DirectX protocols over network play? 3). Are you guys planning on porting Team Fortress 2 or Half-Life anytime soon? Or is Valve going to do that by themselves/not do it at all? Thanks