Web applications become ubiquitous and more complex, often requiring team developmental work. Software configuration management (SCM) systems have long been used for managing collaborative development. However, the centralised architecture -the most common architecture of today's SCM systems -which requires developers to replicate all project source files, is not suitable for Web applications, especially those that are service-oriented and distributed by nature. In this paper, we present Service-Oriented Revision Control (SORC), a distributed SCM model specifically for effectively supporting collaborative programming of Web applications, which does not rely on the centralised architecture or replicate project source files across developers. SORC allows a developer's code to be exposed to their peers as Web services, while revision control of the project is at the service rather than the file level. We have further developed a prototype SCM system SORCER to test the feasibility of the new model.