The document discusses the history and future of grid computing. It describes how SETI@Home helped raise awareness of grid computing by distributing computing tasks to thousands of personal computers. It then discusses how large projects like CERN use grid computing to process massive amounts of data from particle accelerators. Finally, it proposes a model called GridEcon that would create a marketplace to connect those with computing resources to sell excess cycles with those needing computing power, similar to current cloud computing services like Amazon EC2.