I was surfing around the net and found this article interesting. Although I don't have a iPhone I thought I would pass the info along
1. How to get Push Gmail on your iPhone
4. How to enable Emoji icons on iPhone 3.0
5. How to turn off the iPhone's accelerometer
7. How to quickly move apps between pages
8. How to get Hulu TV shows on your iPhone for offline watching
12. How to add words to your iPhone's dictionary
13. How to disable auto-correct and auto-capitalize
14. How To Redirect A Call To Voicemail
15. Easy way to stop iPhone auto-correct by typing "z"
KISS Blog