NSF's NSDL is composed of domain-oriented pathways. Ensemble is the pathway for computing and supports the full range of computing education communities, providing a base for the development of programs that blend computing with other STEM areas (e.g., X-informatics and Computing + X), and producing digital library innovations that can be propagated to other NSDL pathways. Computing is a distributed community, including computer science, computer engineering, software engineering, information science, information systems, and information technology. Ensemble aims to provide much needed support for the many distinct yet overlapping educational programs in computing and their associated communities. To do this, Ensemble takes the form of a distributed portal providing access to the broad range of existing educational resources while preserving the collections and their associated curatorial processes. Ensemble encourages contribution, use, reuse, review, and evaluation of educational materials at multiple levels of granularity.