Below are some great tutorials on the basic functionality of the iPhone from butterscotch.com. If you are new to the iPhone, i strongly recommend that you go thru the entire tutorial series. Although these tutorials are made using the iPhone 3G, the functionality is also applicable to the iPhone 3GS as well.

1.  iPhone overview

2.  The iPhone Interface

3.  Using and Downloading iPhone Applications

4.  Downloading, Installing and Moving Applications…

5.  Getting on the Internet with your iPhone

6.  Camera, Photos and Setting Wallpaper on your iPhone

7.  Synching and Charging your iPhone

8.  Making and Receiving Calls on the iPhone

9.  Sending and Receiving SMS(text) on your iPhone