iOS only: Nike+, the popular run-tracking system that utilises an iPhone/iPod Touch and a sensor chip placed in your shoe, has released a new version that doesn't require a single-use chip and also provides GPS mapping for social exercise management.
We've always been sceptical of the Nike/Apple collaboration on Nike+, which excluded certain iPhone and Touch models and required the purchase of a single-use device. That's why we helped you roll your own Nike+ iPhone for free with RunKeeper. RunKeeper is still a great option on the iPhone (and Android), but those with a lot of friends rocking the Nike+ package or just looking for a new app to try can now use Nike+ on any GPS-powered iPhone. As Gizmodo points out, there's also a Magellan GPS-enabled case for iPod Touch owners, but that adds a good bit of weight to your device.
Nike+ GPS is $2.49 in Apple's App Store. If you're a dedicated Nike+ fan or RunKeeper regular, tell us why you prefer your particular system in the comments.