Hey, e-steamed boritos, I recall there is supposed to be a way to register any old Valve game's CD-key in Steam, so the system will allow you to download/install the latest version of that game, play without the CD inserted (which I guess would be pretty cool for netbook play), etc. But I don't see where to do it on Steam.
Does such a feature actually exist? Or is it the product of a caffeine-addled delusion, a memory miswired, or otherwise implanted memory from an alternate reality?