Ah, crap. I have a massive backlog of games.
For the PC, it's really about NWN2. I only just entered the Market District in Neverwinter :D Very cool so far. Then party interaction is the best of the game so far, it just better stay prominent.
Otherwise, there's still my list of wargames I'm slowly progressing through. Combat Mission: Beyond Overlord (with Barbarossa to Berlin and Afrika Korps saved for after I finish the first one), Airborne Assault: Highway to the Reich (Conquest of the Aegean is also saved up), Take Command: 2nd Manassas, and Hearts of Iron II: Doomsday in coop with jerkface.
On the DS side, I'm still going through Phoenix Wright, Advanced Wars, Rocket Slime, Trauma Center, and Children of Mana in coop with my sister. I finished Megaman ZX, but there's still hard mode to finish. I'm also going through Castlevania Dawn of Sorrow in Julius mode. I'm also unlocking everything in Kirby Canvas Curse.
For the 360, Gears of War is an awesome coop game. We just finished casual and are playing hardcore mode now. GRAW seems kinda limited in coop for some reason. No story mode, no 3rd person look, no ability to get behind cover. What's up with that?