Q: Will we see any graphical enhancements and/or support for future technologies through Steam? A: Gabe talked about how through Steam they could add enhanced graphics as they become available. "If a user say, installs a brand new x900 (assuming that's what is next) that has some fancy new features that their old card didn't support, such as pixel shader 3 (for example). We (VALVe) could release a small update to the game to download that content to that user's computer as soon as Steam discovers the new Video Card". Basically they can release custom content to your computer depending on your system; and if you upgrade to hardware that enables a new technology, it can enable it!
#Half-Life - game resources