I am interested if anyone has developed a client that is intended to present tasks to people. Has anyone worked with any APIs for the presentation of tasks to business users? I am working on a workflow system that exposes a web service interface intended to support development with clients in many technologies. My current design is to implement the OASIS standard BPEL For People (BPEL4People). What I don't have is any experience developing this kind of client. I'd like some any insight into if anyone has used this interface, and if so, what were the hurdles.