It's not enabled by default yet, but Windows users with HiDPI screens eager to try out high-resolution support in Google's browser now can.
Apple's iPad has leapfrogged the Mac in high resolution display support, though an updated iPad screen sharing app brings the feature to Mac users.
New support for Retina graphics helps a lot, but Stephen Wolfram's magnum opus about math, computing, and physics could be so much more.
Newer screens packed with pixels are great for detail, but only if software can take advantage of them.
Fiddling with one part of the HTML standard could ensure that bandwidth isn't wasted delivering big images to small screens and that pictures look good on Retina displays.
Photoshop, Illustrator, and a few other Creative Suite applications will get the Retina Display treatment through updates sometime this fall.
Mozilla preps Firefox for plug-in free, real-time communications in the browser.