Mashup refers to an integrated Application Programming Interface (API) that combines data from different data destination or third party sources for web services. This web service provides a combined API that is technologically valid and compatible with other web applications. In recent years, web Mashups have been implemented for solving many issues in existing web applications, such as e-library. In this paper, we demonstrate a Mashup prototype by analysing a real service problem in an existing virtual organization to show current limitations of using a distributed architecture. This paper also presents an analysis of web service orientated architectures using the Mashup concept. Based on the case issues in classical web portals, we outline a generic architecture that offers a dynamic solution for providing services to better meet users' needs.