Erik Qualman poses an important question, "Does social media = positive ROI?" @equalman addresses this in his latest book, Socialnomics and with this great video:
Design Thinking: Integrating Innovation, Customer Experience, and Brand Value
Stephen Few: Information Dashboard Design: The Effective Visual Communication of Data
Bill Scott: Designing Web Interfaces: Principles and Patterns for Rich Interactions
Chip Heath: Switch: How to Change Things When Change Is Hard
Dan Cederholm: Web Standards Solutions: The Markup and Style Handbook, Special Edition
Andy Budd: Web Standards Creativity: Innovations in Web Design with XHTML, CSS, and DOM Scripting
Robert Hoekman Jr.: Designing the Obvious: A Common Sense Approach to Web Application Design
Mitch Joel: Six Pixels of Separation: Everyone Is Connected. Connect Your Business to Everyone.
Daniel Lathrop: Open Government: Collaboration, Transparency, and Participation in Practice
Erik Qualman: Socialnomics: How social media transforms the way we live and do business