Web Service orchestration engines need to be moreopen to enable the addition of new behaviours intoservice-based applications. In this paper, we illus-trate how, in a BPEL engine with aspect-weaving ca-pabilities, a process-driven application based on theGoogle Web Service can be dynamically adapted withnew behaviours and hot-fixed to meet unforeseen post-deployment requirements. Business processes (the ap-plication skeletons) can be enriched with additional fea-tures such as debugging, execution monitoring, or anapplication-specific GUI.Dynamic aspects are also used on the processesthemselves to tackle the problem of hot-fixes to longrunning processes. In this manner, composing a WebService ?on-the-fly? means weaving its choreography in-terface into the business process.