Thanks to InfoQ, here is a good introduction to Cloud Computing.

David Chappell sees three kind of cloud services:

  • Software as a Service (SaaS): where the user has a browser and everything is in the cloud (GMail)
  • Attached Services: where the user has an application on his PC and this application is ”enriched’ by cloud services (iTunes)
  • Cloud Platforms: where the real user is a developer who uses cloud services to write applications