I understand the RPG community is going nuts at the prospect of Skyrim coming out this fall, but I urge you to consider Lord of the Rings: War in the North as well. Tolkien hasn't been served all that well by video games, but this one might prove to be the exception with its fellowship-like focus on co-op.
Here's a bit of Sinan Kubba's GamesCom preview:
"I'll admit that War in the North wasn't really on my radar before GamesCom. From what I saw in Cologne, though, the game has that Lord of the Rings filmic spectacle mixed in with RPG elements and some hefty, co-operative combat, and is looking good at this stage. The fantasy RPG is enjoying a heck of a renaissance with the likes of Amalur and Skyrim coming out in the coming months. Snowblind will likely have their work cut out to make the game stand out amongst the likes of those, so just how good War in the North's trump card, the co-op, proves to be could be the key to its success."
Check out the rest of our Lord of the Rings: War in the North preview.