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great article here - Responsive Web Design: What Is It and How To Use It via Smashing Magazine http://coding.smashingmagazine.com/2011/01/12/guidelines-for-responsive-web-design/

Responsive Web Design By Ethan Marcotte $9 - ebook http://www.abookapart.com/products/responsive-web-design

Responsive Web Design: Layouts and Media Queries

With the growing number of Smartphone produced in the last three years and the diversity of screen sizes it’s practically impossible to ignore users that browse