Since I work on the Google App Engine datastore, one part of Y!OS that immediately caught my eye was the Yahoo! Query Language, or YQL. It's a SQL dialect and query processing engine that operates on data exposed by web services.
Here's a brief description, along with my thoughts. See the original post for my thoughts on the rest of Y!OS.
This is the companion website for the following book.
Christopher D. Manning, Prabhakar Raghavan and Hinrich Schütze, Introduction to Information Retrieval, Cambridge University Press. 2008.
You can order this book at CUP, at your local bookstore or on the internet. The best search term to use is the ISBN: 0521865719.
The book aims to provide a modern approach to information retrieval from a computer science perspective. It is based on a course we have been teaching in various forms at Stanford University and at the University of Stuttgart.
We'd be pleased to get feedback about how this book works out as a textbook, what is missing, or covered in too much detail, or what is simply wrong. Please send any feedback or comments to: informationretrieval (at) yahoogroups (dot) com