See the links below that might help you with your cloud computing experience:

SLA@SOI  -  EU project to formalize SLA definitions and lifecycle

EC2  - Amazon Web Services; IaaS and associated management services

Azure  -  Microsoft Azure PaaS

Cloud Computing  -  widely accepted NIST definition of cloud computing (US standards body)

How to make sense of cloud computing - an article in Computer Weekly sets it straight

Krishworld talks about cloud computing - see his article Loss of Control and Transparency in the Cloud Era

Joe Kinsella talks about 5 Steps to Managing Cloud Costs in High Tech in the Hub