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Recent trends of Web-based data processing (e.g., service mashups, Data-as-a-Service) call for techniques to collect and process heterogeneous data from distributed sources in a uniform way. In this paper we present WS-Aggregation, a general purpose framework for aggregation of data exposed as Web services. WS-Aggregation provides clients with a single-site interface to execute multi-site queries. The framework autonomously collects and processes the requested data using a set of cooperative aggregator nodes. The query distribution is configurable using strategies, e.g., QoS-based or location-based. We introduce WAQL as a specialized query language for Web service data aggregation that is based on XQuery. 3-way querying is a possibility to optimize requests by reducing the amount of data transferred between aggregator nodes. A Web-based graphical user interface facilitates composing aggregation requests. Our performance evaluation, which comprises aggregation scenarios with different settings, shows the good scalability of WS-Aggregation.