Salesforce.com's sforce Web services API features one of the most innovative and widely used enterprise class Web services. In designing this Web service, the developers had to navigate several challenging issues in how best to create an effective Web service that did not sacrifice capability or simplicity. Learn about the design patterns and techniques developed for this service, and how they might be useful in the development of your widely deployed and sophisticated Web services. Also hear about issues and pitfalls we faced and what we learned in facing these head on.