Star Wars: The Clone Wars hits the Nintendo DS this week, and with it comes a game with a 2 player co-op mode playable via local wi-fi. Players can work together as Jedi combining powers to perform unique attacks.
Red Alert 3 shows up on the Xbox 360 this week after landing on PC shores a few weeks back. The game supports 2 player co-op play through the entire single player campaign via Xbox Live.
Banjo-Kazooie: Nuts and Bolts also releases for the Xbox 360 this week, and while the game is playable in co-op through the story mode - there are co-op specific mini games for 2 players available offline. This could be a good one for the kids, especially at the friendly $39.99 price point.