The Strava Objective-C SDK by Sebastien Windal is a read-only project that allows to access fitness features. Not officially supported by Strava, this project was originally created for SpinSpin, an indoor cycling app. However, it supports most of Strava API endpoints.
Microsoft has just released a new Silverlight version of Bing Maps that is full of new features and upgrades. Although it's hard to say whether this release of Bing Maps has "stolen the cool crown" from Google, the new features do provide some additional value for users. The "beta" release is not yet available by default, though you can preview the latest version at: http://www.bing.com/maps/explore.
If you enjoy creating fun, interactive maps, you'll get lost in the latest functionality from UMapper (our UMapper mashup profile). With it, you can include any image--even one that isn't a map--in its Flash viewer.
The Fleetly API infuses your app with tools for the workout crew. Information is available through a user account. In a crowded fitness app market, Fleetly aims to make the work outs social. You earn badges but also get ranked against others.