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.
For months, the Bing Maps site has been showing off what are essentially embedded mashups. You can search nearby tweets, FourSquare check-ins and other content from partners. Until now, it was merely a showcase of apps either written internally or by a company that Microsoft had blessed. Now, you have the opportunity to get your mashup included on Bing's map.