Joe Hewitt, has released the facebook source code library in Objective C for iPhone developers. This is a real good resource for developers that are looking to integrate their iPhone applications with Facebook. Download it from here.

[source infoworld]

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jQTouch is a jQuery plugin that allows development of iphone web applications with native animations and default application styles. Alpha release is available here.

Good news for iPhone developers, Facebook has released a SDK for iPhone; Facebook Connect, that allows developers to hook up their native iPhone applications with the Facebook and take advantage of the vast facebook userbase. Download the SDK from here.

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Yes, creating native iPhone applications using common web technologies is possible now, using PhoneGap. PhoneGap is a cross platform mobile framework that lets any web developer make native iPhone, Android and Blackberry applications.

If you have been troubled with mundane tasks like Get Today’s date while developing your iPhone applications then this tutorial is for you.

[source howtomakeiphoneapps]

An excellent tutorial along with code snippets for writing an OpenAL sound loader, OpenAL wrapper class and actual code to play some audio files in iPhone.

[source Gehacktes]

A very thorough article including the source code, for loading multiple images from sites like flickr in your iphone app in an asynchronous manner, so that delay is less and user experience is quick and neat. Read it here.

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A quick and short tutorial plus code for calling mail app in iphone from your application and automatically filling in the address, subject and content. Read it here.

[source iCodeBlog]

A very detailed article along with code samples for extending iPhone SDK UIColor class and make it more useful by Ars Technica.

 Some of the best practices given below.