This is a great idea. I've always loved the collaborative style of learning. This the type of learning I encourage in my classes. It's one thing for my students to give the right answer, but it is more interesting when they discuss how they got the answer.
Take GrockIt and add the ability to build game characters based on knowledge and you could have a very interesting learning environment.
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Jason Kincaid from Techcrunch has a writeup with his thoughts, along with some transcripts from the panel of experts:
http://www.techcrunch.com/2008/09/10/tc50-grock...
Take GrockIt and add the ability to build game characters based on knowledge and you could have a very interesting learning environment.