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Lucid Overview of iOS Multitasking
Quite an insightful post with thorough, perspicuous explanation of how multitasking works in new iOS4. It might not be 100% gold master apple reference guide, but definitely is still a place for you to start if you wanna get your hands on multitasking/fast app-switching in your apps. 
Oliver:
Adding fast app switching and multitasking support is quite easy since for the most part you don’t need to do anything. But you WILL have to review the contents of your app delegate methods to see which code has to be moved into one of the other delegate methods now.
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