8 Effective Plugins for Optimizing Your WordPress Site for Mobile – WPMU DEV.
BuildMobile | Build a Responsive, Mobile-Friendly Website From Scratch: Design a MockupBuildMobile.
Build Responsive, Real-Time Graphs in WordPress: Introduction – DesignFestival.
BuildMobile | Build a Responsive, Mobile-Friendly Website From Scratch: IntroductionBuildMobile.
BuildMobile | Understanding Responsive Web Design: Responsive ImageryBuildMobile.
Responsive Sketchsheets – ZURB Playground – ZURB.com.
Responsivator. Fantastic free resource that shows you how a site displays on different size devices!
How to Design a Mobile Responsive Website | UX Booth.