Ars Technica takes a look at LiveRider, a cycling computer app for the iPhone

I've become a bicycling addict. Since realizing in July 2009 that bicycling is a fantastic way to get rid of the excess weight I've been lugging around, I've ridden more than I ever thought possible always with my iPhone mounted to the handlebars. Using MotionX-GPS, I tracked every ride I went on, watching my average speed and distance increase gradually over the months. But for a cyclist, a GPS only goes so far, as it tells you little about how you're riding. There's no cadence feedback. That's why I was intrigued by the LiveRider, which turns any iPhone or iPod touch into a cycling computer via a 2.4GHz "cycling computer dongle" that plugs into the base of your device.

  LiveRider turns your iPhone into a cycling computer