AirDisplay, a $10 application that lets your iPad function as a second (or third, fourth, etc.) display for your Mac/PC, was just updated to allow it to push HiDPI pixels to the new iPad. We explained it all here.
Developer Avatron announced its “Air Display” app, which allows iPhones, iPads and Macs to act as a second or third monitor, would be implementing support for the 2048-by-1536 resolution of the new iPad’s 264-DPI Retina display. That means you will soon be able to use your third-generation iPad as a 2048-by-1536 computer monitor.
To turn on HiDPI, you just go to the Displays Preferences and select 1024×768 (HiDPI)…HiDPI has been shipping with Mac OS X for some time. But it isn’t enabled in the System Preferences, because until now there hasn’t been a mass-produced computer display with high enough resolution to do it justice. That’s where Air Display and the new iPad come in.