If you need some evening gaming, PC.IGN has a multiplayer (Assault and Skirmish modes) demo of Fallout Tactics: Brotherhood of Steel. Fallout Tactics is described as a "squad-based, third person tactical combat game with RPG character development and a mission-based story line" and this demo is 125mb, available as one big file or 14 smaller parts. It includes the single-player levels from the previous demo.