We usually don't make too big a deal about demos, unless of course, they have co-op. The Cursed Crusade demo supports local co-op and is available now on Xbox Live. It should be on the PS3 soon. Through the magic of the internet I have played the demo while writing this sentence. It's cheese-tastic and fun, and more importantly, the game was made with co-op in mind. You even can switch the split screen from vertical to horizontal! We'll have a full review when the game comes out later this month.
The Cursed Crusade will launch on October 25th for the Xbox 360, PC, and Playstation 3. It will support two player local or online co-op.