I read some of the materials from this site. It is quite academic, and really aimed at simple end applications for mass markets. Not that that is a bad thing of course.
One of the applications discusses mobile music making collaboratively. I’ve always liked the idea of real time collaboration using mobile media. There was an interesting proof of concept on the Bhajis Garden site (click the title for the link).
The idea was to have a bluetooth transport within Bhajis Loops that would allow users to collaborate and interact. Sadly this never made it into a build of Bhajis Loops.
But would people use it? Is it a killer app? I don’t think so. I just can’t see how it would work, especially with essentially non-musical types. If it was a killer app then people would have found a way to do it already.