Ponder the photo you see above for a moment. Yes, that's Apple Musicrunning on a BlackBerry phone powered by Android -- products from three mobile rivals working in harmony. The very concept of this would have been outlandish just a year ago, let alone a few years earlier when these companies were at each other's throats. This is the best sign yet that some of the walls in mobile tech are finally tumbling down. Companies are realizing that they sometimes have to play nicely with each other if they want to succeed... and that's good for everyone.