Half-Life 2 goes 64-bit
Valve has released 64-bit versions of Half-Life 2 to current Half-Life 2 owners via Steam. This article doesn't really mention any rela change in gameplay, just that it now works on 64-bit systems. I guess this can be seen as a kind of stepping stone for Valve, a precursor to the next Valve game that will probably make better and cooler use of the 64-bit-ness to give us Half Life 3. Maybe.