Made by Rasterwerks, Phosphor is a multi-player first-person 3D shooter that runs in your browser, thanks to the Macromedia Shockwave browser plug-in.

The game is currently in beta, but looks pretty darn impressive when you get it up and running. Understandably, it takes significantly longer than most browser-based games to load, but considering what it is, it's not that long.

Obviously, as with any beta software you may run into issues. But honestly, isn't it worth it to be able to frag at work - not that we'd suggest or condone that sort of behavior.