In recent years Web services and their associated standards have received an enormous amount of attention. Web services hold the promise of creating a distributed global repository of network addressable units of computation. This repository will undoubtedly generate a disruptive force that will fundamentally change not only the methodologies and techniques used for software construction, but will even challenge our perception of what constitutes a software application. In the future software applications will be increasingly amorphous, dynamically adapting their composition at run-time in response to changes in environmental context and conditions.