Books
The Usability Kit by Gerry Gaffney and Daniel
The Usability Kit covers how to design, structure and test usable web sites. In addition it provides guidance with best practice sections, blueprints and pitfall flags.
The Visual Display of Quantitative Information by...
The Visual Display of Quantitative Information by Edward Tufte covers theory and practice in the design of data graphics, 250 illustrations of the best (and a few of the worst) statistical graphics, with detailed analysis of how to display data for precise, effective, quick analysis.
Web Analytics: An Hour A Day by Avanash Kaushik
Written by an in-the-trenches practitioner, this step-by-step guide shows you how to implement a successful Web analytics strategy.