What's the difference between an iPhone and an iPhone 3GS?

I was searching the web for an iPhone and saw both. The iPhone is only $99.99 and the iPhone 3GS is $199.99. The iPhone seems like a good deal but I just want to make sure. What does the iPhone 3GS have that the iPhone doesn't have?|||The iPhone is just an older virsion...But the iPhone 3GS comes packed with more things...such as apps %26amp;%26amp; what not...|||-video camera


-gps


-faster processor





not much... but its worth it.