Client-server architectures and methods for zoomable user interfaces

Exemplary embodiments of the present invention provide methods and systems for communicating and processing data in communication networks, e.g., cable networks and/or interactive television networks. Selective use of different data streams and encoding techniques enable sophisticated user interfaces to be generated on client devices having varying processing capabilities. MPEG encoding techniques have reduced complexity to enable better response time to user requests. Specialized user interface features, such as hoverzooming, are enabled.