Guide to responsive design, why/how/when/where and on what.
Good article about how to design responsively.
Neat CSS tricks for drawing shapes WITHOUT canvas or SVG.
Cheatsheet for facebook dimensions.
Luke Wroblewski is brilliant. This article explains the different approaches that can be used in designing for multiple devices.
An article about valid JS variable names. I actually did not know how many unicode characters were valid Ecma syntax...
Descent article about how a website should be built with the end-user in focus. Good read. Well worth saving.