Ecomonics of Cloud Computing, presented by Bill Sempf. Return on Investment is key for large and small organizations in these risky times. A key mitigator of ROI risk is the avoidance of captila expenditure on IT infrastructure. While tradtional Applicaiton Service Provider style hosting services do fit this bill, ther eis a new service ont he horizon tha thas key benefits over the ASP model -- cloud computing. Cloud computing leverages virtualized resources to isolate the developer and user from details of the infrastructure, while spreading infrastructrure capital expenses over a large number of hosted applicaitons. Bill will discuss the realities of hosted applicaitns, including the current popular ASP models, and compare them to cloud computing. There will be an overview of cloud computing architecture and strategy. he will end with a comparison of various commercial cloud sevices, incuding Google AppEngine, Amazon S3 and Microsoft Azure.