Developer/Karbon founder Garrett Murray:
The app landscape will improve with time, but the internet is a different story.
Going forward, hopefully, most thoughtful folks will make new websites Retina-ready from the start. When I created the site for Scratch, I did just that, and it looks amazing on this new rMBP. But for the most part the internet will look relatively crummy on Retina displays for quite a while.
Very true. In short, there’s no magic bullet yet for effective, responsive images that scale to both retina level and “standard def” displays. Fascinating to see how this will all play out in the web dev and design community over the next few months.