The Dailymile Ruby SDK by Dailymile supports most points in the API, allowing developers to integrate fitness tracking features into social applications. Resources available to authenticate with OAuth and interact with REST protocols.
At the beginning of 2011 we reported that Collect had decided to drop it's API in order to change their offering to something more profitable. But now ReadWriteWeb have reported the disappointing demise of Collecta. This has the potential of being the first big failure of a well funded real-time web focused company, so questions need to be asked about why this happened and why Collecta weren't successful. Back in January of this year we asked "Is It Finally the End for Real-time Search Engines?" and it now looks like that very question is being raised again.