title: Converting site for Retina-resolution screens
body: <p>Apple's new <a href="http://www.apple.com/uk/macbook-pro/">Macbook Pro</a> has a 15" screen with a resolution of 2880x1800. At present it's scaling websites resulting in pixel-doubled images and a layout which appears double-scaled too.</p>
  
  <p>As a web developer how do I go about converting my existing PHP/XHTML/CSS website to take advantage of high-DPI screens?</p>