Web Analytics 2.0 — Resources about Web Analytics 2.0 by Avinash Kaushik, the leading book on understanding and using web analytics.
Advanced Web Metrics with Google Analytics — Resources about the book Advanced Web Metrics with Google Analytics. Now in it's third edition, Brian Clifton provides insight into using Google Analytics effectively.
Ask, Measure, Learn — Resources on the book Ask, Measure Learn; which guides readers to extract business value from their gathered data by asking the right questions, measuring the right data, and learning from the results.
Lean Analytics — Resources on the book "Lean Analytics" intended for startups, but with information for any size business on knowing and measuring the metrics that matter.