LukeW Ideation + Design provides resources for mobile and Web product design and strategy including presentations, workshops, articles, books and more on usability, interaction design and visual design.

[…] wie im CSS als Hintergrund definierte Bilder für das Retina Display des iPad 3 / iPhone 4 vorbereiten […]

This page lists a ton of different devices and media queries that would specifically target that device. That's probably not generally a great practice, but it is helpful to know what the dimensions for all these devices are in a CSS context.