You can easily download Mac OS X Mountain Lion from the App Store any time after purchasing it, but if you want your own physical copy of the installation, here’s how to make your own Mountain Lion install DVD or USB drive.
A nice handpicked selection of good Google Web Fonts.
Dive Into HTML5 elaborates on a hand-picked selection of features from the HTML5 specification and other fine standards.
retina.js is an open source script that makes it easy to serve high-resolution images to devices with retina displays
Tutorial using CSS media queries to serve up styling condition to the device’s pixel density.
Fresco is a beautiful responsive lightbox. It can be used to create stunning overlays that work great at any screen size, in all browsers on every device.
Fixing one of the most annoying "features" of OS X Mountain Lion
The ultimate resource in grid systems.
A collection of inspirational websites using media queries and responsive web design.