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This Is Responsive | Tips, Resources and Patterns for Responsive Web Design
Patterns, resources and news for creating responsive web experiences
Really Useful Resources and Tools for Responsive Web Design
11 Free Tools Important For Web Developers
Gridulator: Make pixel grids, lickety-split
Tell Gridulator your layout width and the number of columns you want, and it’ll spit back all the possible grids that have nice, round integers
HTML5 Doctor
Helping you implement HTML 5 today