
http://www.kickstarter.com/projects/1330531709/jalapenotm-portable-beat-maker-for-action-sports
The idea that you could create your own beats that would match up with the run itself would make things a lot easier in the editing process and also could lead to interesting remixes.
Here's their video:
It's through Kickstarter so there's a chance it won't even be funded, but I think it's still a compelling idea nonetheless.