We had such a great response from our iPhone icon set, and so many requests for larger formats, that Alex decided awhile back to build them out for Retina display. Each icon is now available at 3 sizes: 64 x 64, 48 x 48, and 24 x 24.
They are licensed under a Creative Commons Attribution-Share Alike license. You may use the icons for both commercial and non-profit purposes, as well as modify them (in fact we challenge you to make ‘em better).
Download all sizes here: TWG Retina Icons Zip
Enjoy everyone, and send your karma over to Alex Shutin for his amazing design work!