Well today I stumbled across a pretty weird shooter that I downloaded simply because it's the first game to use a real-time ray tracing engine. What's so great about that? Well, ray tracing is a pretty intensive operation used in programs like 3d studio max, maya, xsi etc to get the kind of realism you otherwise couldn't get. The download is only 7 megs, and while it's far from a good game or anything the graphics (especially the shadows) should interest those with decent vid cards..
Check it out @
http://www.virtualray.ru/eng/download.html
Theory and screenshots @
http://www.virtualray.ru/article/raytracinggame.html