Apache Mahout: Scalable machine learning for everyone by Grant Ingersoll.
Summary:
Apache Mahout committer Grant Ingersoll brings you up to speed on the current version of the Mahout machine-learning library and walks through an example of how to deploy and scale some of Mahout’s more popular algorithms.
A short summary to a twenty-three (23) page paper that concludes with two (2) pages of pointers to additional resources!
You will learn a lot about Mahout and Amazon Web Services (EC2).