Virtual has this excellent article for all the iPhone user which might be really helpful.
The iPhone Development Roundup: 100 Apps, Tools, and Guides
By Jessica Hupp

Whether you’re developing for the iPhone or just want to find more ways to play with your shiny new toy, there are loads of resources out there designed to help you out. From cool apps, to helpful tools, and easy to use guides, we’ve found 100 of the best. Read on to discover some of the most fun and useful developments for the iPhone.

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