Amazon Web Services and Amazon Business Solutions. They offer the following infrastructure services for developers:

• EC2=Elastic Compute Cloud (Computing/processing in a cloud)
• S3 = Storage in a cloud
• SQS=Simple Queue Service (Messaging between different parts of applications)
• SDB=Simple Database (Database in a cloud)
• Flexible Payment Service (Money processing. They don’t call it FPS for some reason 🙂 )

Above those services they offer Dev Pay which allows developers to put their own business model over the infrastructure.
Very interesting business model for Amazon.

A video interview by fastcompany.tv of Jeff Barr, Amazon’s evangelist for its Web Services team.