architecture of apps in the cloud

I'm looking to do some research on self-organising architectures for applications in the cloud. As a part of the lit-survey, I'm looking to understand the current architectures of apps in the cloud, how they manage scaling, how they optimise w.r.t to performance vs. cost tradeoffs.

The urls that seem to at least mention the architectures of apps in the cloud are:

http://www.vertica.com/casestudies/Sonian

http://blogs.smugmug.com/don/2008/06/03/skynet-lives-aka-ec2-smugmug/

http://www.rds.com/books/looselyCoupled/index.html