Services Oriented Architecture (SOA) and Web 2.0 are two complementary trends towards a programmable Web. In this respect, the WS-* stack became pervasive for Enterprise Application Integration and Mashups attracted interest as novel Web 2.0 applications combining heterogeneous Web sources. While most Mashup tools focus on the integration of lightweight Web Services (i.e. RSS/Atom, REST), evolving Enterprise Mashups particularly need to integrate WS-* for enterprise-class data and logic. Hence, it requires experienced developers to prepare rather complex WS-* (e.g. as widgets) to enable casual developers and business users to create Mashups. Therefore, we postulate the hypothesis that this requires an a-priori simplification and cognitive support. In this abstract, we propose a research agenda on how to address such a simplification approach for Enterprise Services to ultimately empower business users to create real enterprise-class Mashups.