160 High-Quality & Free iPhone Toolbar Icons
The Working Group, a talented web agency, has created a set of pixel-perfect iPhone toolbar icons and released them for free.
iPhone Toolbar Icons consists of 160 items in transparent PNG which are sized 30*30px.
Items included in the set are very common ones that any app can require (like arrows, charts, media player and text editor actions, etc.)
There is also a retina display version of the set with 3 different sizes (24*24px, 48*48px and 64*64px).
Website 2: http://blog.twg.ca/2010/11/retina-display-icon-set/