An anonymous reader writes "A couple of guys (us) in Cambridge have written a cycle routing system, CycleStreets.net, based on open data, and have now released it as a free iPhone app. It's been done on a shoestring, in spare time. There's an API and some disruptive tech in the form of a photo submission screen where street problems can be submitted directly. Because it's open data, you don't have to wait 6 months for the routing to be fixed if there's a bug. Android and .mobi versions are in the works, with the apps being done on GitHub."