Here's an interesting approach (using a blog) to handling elearning design situations: elearning Design Challenge: "Every week or two I’ll try to publish a situation that describes a discrete topic to be taught online. Some topics are just so difficult, dry or abstract that they defy instruction. That’s what the challenge is all about...Then I hope people like you will get involved and offer solutions and suggestions as to the best way to teach the topic online."
I wonder if a wiki might be a better implementation - whenever I think collaborative content creation, I think wiki. Still, the comments on the two challenges I reviewed on the blog are helpful. RSS feed is available.