Oak Ridge and Sandia National Laboratories host Workshop on Exascale Interconnection Networks. The workshop sought to prioritize the challenges facing interconnect technologies, looking toward deployment of Exascale supercomputers within the next decade; it provided a broad view of the problem by bringing together experts in the fields of interconnects, system software, applications, and integrated device technologies. The seventy-six attendees were from a wide variety of institutions, spanning academia, industry and government, including representatives from DOE Office of Science, National Nuclear Security Administration, National Science Foundation, Defense Advanced Research Projects Agency, and the Department of Defense. Two days of discussion focused on ranking these challenges in four areas: network topologies and routing; processor network interfaces; device technologies; and, performance prediction and simulation. The event was sponsored by the DOE Institute for Advanced Architectures and Algorithms (http://iaa.sandia.gov) – a joint institute between Oak Ridge National Laboratory and Sandia National Laboratories. The final workshop report with findings and recommendations is now available at http://ft.ornl.gov/pubs-archive/iaa-ic-2008-workshop-report-final.pdf.