Warcraft III - Frozen Throne and Starcraft: Brood War (oldbie but goodie) are very good games for network play. Command and Conquer Generals - Zero Hour isn't too shabby either. All of them are real time strategy titles that involve building an army and killing your opponent's army (Starcraft is set in the future, Warcraft in the past, and Generals right now in the real world). I have to say that allied Warcraft III is my favourite network game at the moment. Heroes, NPC creeps, items, spells, lots of goodness.