General

• Above the Clouds: A Berkeley View of Cloud Computing - Berkley article about current state-of-the-art in cloud technologies. Also describes problems and possible solutions. A very good material for getting an overview of the field.
• March 2009 IEEE bulletin - includes a set of interesting cloud related articles.

Use cases

• Building a Cloud for Yahoo! - Description of Yahoo! deployment model: vertical vs horizontal services, Hadoop and some other frameworks for data processing.