Valve's SteamPowered website has been updated with details regarding the latest update for its online delivery system Steam. This release includes a number of very specific CPU and memory footprint optimizations brought over from the Half-Life 2: XBOX development codebase. The release also includes all of the engine groundwork to enable the Day of Defeat: Source launch that will happen Monday, September 26 at 3:00 PDT. Just restart Steam for the effects to take place.