Well, let me first say that I don't have Live o_O
So, I'm stuck offline. But there are still some awesome games. In no particular order:
Ninja Gaiden II - The weapons were insane and I loved the fast-paced combat. Definitely one of the best action games out there, as well as the rest of the Gaiden games, because they force the player to master every technique at their disposal if they hope to defeat the tougher enemies, instead of just button-mashing their way through the game.
Frontlines: Fuel of War - Rented it from Blockbuster just yesterday and I love this game. The weapons are great, the vehicles (both land and air) are just plain crazy, and the drones add a whole new dimension to the combat. And that's just offline. IMO, better than Halo 3 and, dare I say, Call of Duty 4.
Battlestations: Midway - Action/strategy games don't get any better than this. Period. The tactical side is easy to master, with the controls leaving you able to effortlessly coordinate your whole fleet, and the ability to switch instantly between ships, aircraft and submarines to launch attacks on, above and below the surface of the water is a unique and incredible feature.
Sid Meier's Civilisation Revolution - Sid's outdone himself yet again. CivRev is a new, IMO far more user-friendly take on the truly epic Civ games, with an almost cartoony graphic charm that doesn't detract from the unparalleled sophistication that made the Civ titles such a success. The learning curve isn't too steep, the technology tree is massive, and the tutorial almost gives a pick-up-and-play feel to the game.
Which side of the divide do you stand on? Find out in this Harry Potter/Star Wars crossover, Divided WorldsWow. I've been here for over a year. :]