Along with Dan Perkel and Christo Sims, I've just published a paper drawn from our work on the Digital Youth Project a few years back. I'd be interested in any and all comments:

Judd Antin, Dan Perkel, and Christo Sims, "Unexpected Collaborations: Kids' Appropriation of GarageBand as a Group Creative Tool" (December 1, 2008). School of Information. Paper 2008-027. http://repositories.cdlib.org/ischool/2008-027