And right there you're going to need a sizeable chunk of X windows, and a C library, and network configuration utilities, hardware management tools (looks like this is aimed at commodity hardware + reference machines from Valve) and the guts of a web browser and Steam itself. I wouldn't be totally surprised to find coreutils or at least busybox in the default install too, for aiding and abetting system initialising (and to please the intrepid few who somehow make their way to a command line).
Sure, not contending there is userland, just wondering if there is any interesting userland that Valve develops. They won't be open sourcing steam, so the fact that they release their build of X windows that is exactly the same as upstream isn't very interesting.
