High resolution UI Elements for iPhone 4 (Tab Bar buttons...)

where can I 开发者_JAVA技巧find high resolution version of standard iPhone UI elements (like UITabBarContacts.png). I have found low resolution version of icons on some site. I need them becasue I would like to upgrade my app for iPhone 4.

Thanks!

I'm not sure if this is what you are looking for, but the only place I've found quality UI graphics are from these guys:

http://www.teehanlax.com/blog/2010/02/01/ipad-gui-psd/

and

http://www.teehanlax.com/blog/2010/08/12/iphone-4-gui-psd-retina-display/

and

http://www.teehanlax.com/blog/2010/06/14/iphone-gui-psd-v4/