Interface Builder System Media Library Empty in iPhone 3.0 SDK

Answer 1

I do not believe that there are any system media elements exposed through IB on iPhone, only on the desktop Mac OS X. There are obviously several things (like system button images, backward and forward arrows, etc) that would be useful, but only a small number of them are exposed, and where they are exposed they are exposed through constants you pass to particular classes, not as images and sounds you can use directly.

I recommend filing an enhancement request through bugreporter.