book: Collective Intelligence in Action

From editors site:

Collective Intelligence in Action is a hands-on guidebook for implementing collective-intelligence concepts using Java. It is the first Java-based book to emphasize the underlying algorithms and technical implementation of vital data gathering and mining techniques like analyzing trends, discovering relationships, and making predictions.This book is for Java developers implementing collective intelligence in real, high-use applications.

Overall i liked it and have learned loads, it does have more Java code in it that i'd wanted, but for the ones who intent to use Java language the code in the book is handy, well, its after all a Java book, right? There's also some very useful, class diagrams that will help you to use the code described from JRuby, Clojure, Scala...

Its goes through all the process of: explaining the data structures needed to represent data in your app, how to collect data from web(blogs, etc), theory & implementation of mining algorithms, leveraging open source tools like Weka and Lucene, up to how Amazon, Google News and Netflix do their data mining(to some extent).

Liked also the data mining(machine learning) summaries on different data mining techniques, very compact and nicely done.