The Inq-well's laying it all down on what is rumored to be the upcoming expansion pack for HL2.

"PC Gamer also has information about 'The Lost Coast', the fabled high-end graphics level. According to Valve, the level will require 1GB RAM, a 3.2GHz processor and a top-end graphics card. One of the new features will be support for High Dynamic Range lighting. Interestingly, ATI - big-money sponsors of Half-Life 2 - don't support the industry standard for HDR lighting, which is OpenEXR."