This document discusses using hybrid cloud and grid infrastructure for high-throughput computational science. It provides an overview of the Nimrod toolkit, which supports parameter sweeps, optimization, and workflows across distributed resources. A recent experiment used Nimrod to complete jobs faster on grid resources than Amazon EC2. It also outlines a potential strawman project called GEMAP to enable grid-enabled microscopy across the Pacific using remote microscopes, compute clusters, storage, and visualization portals.