Bracing itself for the large Unreal Tournament 3 patch that is due out soon, Valve today enabled free Steam registration for the game.

The registration is a simple matter of entering the CD key in Steam’s activation menu. Any CD key should be eligible for activation, including versions of the game purchased from other digital distribution services. However, the activation will require a new installation of the game, so if you don’t want hard drive bloat, be sure to uninstall your old version first.

The update will bring over 50 Steamworks Achievements, as well as new features and enhancements in AI, mod support, server browsing and more.