Apple fans have been oohing and ahhing since the MacBook Pro with Retina display was announced a few weeks ago. Let's face it, the display looks incredible! With Retina displays starting to make inroads into the world of Mac, gdgt's Ryan Block decided to take a look at what screen resolutions would be required on the rest of the Mac line to achieve a pixel density similar to that on the new MacBook Pro.
What Block did was to figure out the current pixel density and size of Mac displays, then figure out what it would take to approach the 220 pixel per inch (PPI) display on the Retina display MacBo
