iPhone GUI as Adobe Fireworks Rich Symbols Library
Just noticed jorge.hipster, bomberstudios, kekoponte have uploaded a beta set of user interface components for iPhone that will help designers quickly mockup functional prototypes to show their clients in Fireworks. Good news is you dont have to re-create these assets! They added a lot of properties to the Rich Symbols so you dont have too! One up for the community helping the community!
Google code - iPhone components
http://code.google.com/p/iphone-gui-fireworks-symbols/