MQtest.io — A simple tool to help identify which media queries your device responds to.
min-device-pixel-ratio test
What’s your device’s min-device-pixel-ratio?
Responsive Design : Le guide de référence pour les SEOs
Web Design réactif Article traduit de Seomoz.org : Responsive Web Design: The Ultimate Guide for Online Marketers http://www.seomoz.org/ugc/responsive-web-design-the-ultimate-guide-for-online-marketers
The Responsive Designer
Screenqueri.es | Pixel Perfect Responsive Design Testing Tool
Sweet
The Developer's Friend: 400 Glyph Set
Responsible responsive images
Techniques For Gracefully Degrading Media Queries
Responsive Web Design: Helpful Articles, Techniques & Tutorials
A Beautiful Boilerplate for Responsive, Mobile-Friendly Development
Adactio: Journal—Sea change
Responsive design
Here’s what we’ve learned about doing UI for mobile web apps with WebKit - (37signals)
A couple of useful tips on fonts and form elements
10 tips for designing mobile websites | These Days Labs