This C#/.Net SDK provides programmatic access to manage, track, schedule and reporting functionalities of TSheets. It enables you to integrate with accounting or payroll software to utilize the TSheets RESTful API and allows developers access to features for web-based and mobile applications. TSheets is a QuickBooks services that is cloud-based time tracking and scheduling solutions.
Peter Coffee, Director of Platform Research at Salesforce.com, has published a compelling post about "The Incredible Importance of Open APIs" over at the Force.com blog. In case you may have forgotten, Salesforce.com's web APIs are an integral part of the company's offerings, with a variety of internal and third party products that rely on these APIs for literally millions of transactions a day (in fact, by January, 2008 Salesforce.com had already served 24 billion API calls).