I met someone using this 3d system for GoPro who liked the results.
GoPro 3D HERO System - World's Smallest 1080p 3D camera
I think it's a bit convoluted. I've ended up using my cameras (a couple of Hero2s) for two things mostly...to vid myself doing riding exercises, videoing others at their request, and for taking pics. The ability to take a picture every "x" seconds has been my favorite feature. By setting them up at various angles they will take hundreds of high def pictures of everything along rides. Can then weed through them and save the best shots.