I'm doing the RCLT (Ottawa) century this weekend with a friend who's got a new setup on his bike for this year. He's got a bike mount for his iphone and a battery pack of some sort. He's also installed a GPS app that every so often emails a distribution list with our current coordinates. So while I'm in Ottawa on the ride, my wife back here will get emailed every 20 minutes with our current location. Pretty neat application for those that century rides!