I recently noticed that all Stack Exchange sites have some pixelated favicons.
As you can see, Gmail has support for Retina Display favicons, while Twitter and SE sites do not. It looks worse with the graduated sites.
I did notice that the StackExchange™ MultiCollider SuperDropdown™ and the rest of the top bar does seem to have support for Retina Displays though.
This is kind of a nitpick of a feature request, but could SE add some higher resolution favicons to stay consistent with the new StackExchange™ MultiCollider SuperDropdown™?