http://www.unrealtournament3.com/
This is the Beta Demo for Unreal Tournament 3.
The beta demo consists of three different action-packed Deathmatch and Vehicle Capture the Flag maps: HeatRay, ShangriLa and Suspense.
All maps in the demo can be played locally against bots, or online against human opponents. Unreal Tournament 3 is currently slated to ship in November for PC.
Get ready to get your frag on! - GameUpdates
Download at (UT3BetaDemo.exe, 741MB):