Google App Engine
Web developers dream of getting their hands on the collective power of Google’s servers. Google App Engine offers a free corner of the Google universe.
Amazon started converting its excess computational power to cash some time back. Under illustrious-sounding names such as EC2 (Elastic Computing Cloud), S3 (Simple Storage Service), and SimpleDB, the book-and-coffee-machine mail order company has had considerable success leasing virtual machines, disk space, and distributed database services to users.