Preface
These are just random links and notes from my own research. Little or no experience is implied.
Shared Hosting
IaaS
PaaS
Providers
dotCloud
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Heroku
Google App Engine
Articles
Open Source
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OpenStack (IaaS)
Eucalyptus - Amazon AWS-compatible Auto Scaling, Elastic Load Balancing, and CloudWatch
AppScale - Google App Engine-compatible PaaS; automatically adds and removes instances on AWS or Eucalyptus