Modder/programmer/futurist Nathan Andrews has been working on a virtual reality set-up for Half-Life 2 and Black Mesa: Source. Fresh videos on Reddit offer exclusive glimpses of a not-too-distant future in which we our gaming time spinning round and round shooting invisible enemies with a plastic gun and occasionally walking into walls. I for one welcome this future, and you might too once you've seen Nathan's excellent work in motion in the videos below.
Update: Vimeo seem to have scuppered the first video, so we've replaced it with the YouTube version. Due to EMI copyright shenanigans you might not be able to see it in your region, but you can check out Nathan's other videos on his channel.