(former Developer Corner & Offical Apple iPhone SDK forum)
Talk about hardware and software development here.
Dont bother developers with stupid questions or you will not be allowed to read the Developer section, and eventually banned from the forum.
Here goes everything regarding UIKit and other Third Party Native iPhone/iTouch Applications made with the toolchain and distributed via installer.app.
Also you can post on moding your Sprinboard here. (plist editing etc.)
Do not post Official AppStore Apps threads here.
Not that nice than native software but still a nice thing to know, there are still a few real perls within the sea of iphone web 2.0 applications. Fell free to discuss about web applications here. Web coder talk is welcome here as well