The version 1.1 patch for Batman: Arkham Asylum should now be available on Games for Windows LIVE, among other things adding PhysX support to the superhero game (there's a new video on the YouTube with comparisons with and without PhysX). A manual version of the patch is also available thanks to The Patches Scrolls, available on FanGaming, FileFront, Gamer's Hell, The Patches Scrolls, and Strategy Informer.