Martin Karasek has posted a handy set of vector Retina-ready elements for iPhone apps. Feel free to preview before downloading if need be. Looks like he will be adding even more elements in the near future as well.
About Brian Hoff: Designer, Writer and Speaker
I’m a graphic designer living in Brooklyn, New York who loves creating compelling and useful websites and memorable interactions across the web. When I’m not designing I can be found writing, speaking and occasionally part-time teaching at colleges — all on the subject of design. I started this blog to share my passion and experiences with designers and clients. I'm most active on Twitter; say hello: Follow @behoff