Thanks for your comment Dan.  I agree that rewards are key.  Yet I also think we need to look beyond purely extrinsic rewards and find ways to tell the stories that bring to life the more intrinsic rewards of collaboration so people begin to naturally seek opportunities to collaborate.

I've seen quite a few people raise their hand to be on a special project team because it was believed to be good for their career, not because they had any interest in being part of the team or in collaborating with others.