iPhonehacks.com posted a nice article about iOS 4 tricks which you may find useful. The tricks are about contacts listing, facetime and ibooks. So if you like finding out new ways to control your mobile device you will be happy with this post. Go read it.
I??m getting the phone on the 24th May 2010, next Monday. Those who are interested please name your price immediately!
I am definitely going to try these iOS 4 tricks. I am going to tell my friends about it as well.