What's the difference between the iphone 3g and 3gs?

I have the iPhone right now, and have had it for almost a year. Should I get the iPhone 3G? What are all the differences?

can you buy the iphone 3gs 8gb in white? or does it have to be 16gb to be white??

Do you know how much an iPhone 3G costs?

is it reallt worth the money , im getting it for my bday ! if you have one tell me the cool feature and your opion on it

The2g has a plastic back cover? And the 3g had an alluminon back cover? Can you get a 3g back cover what would fit a 2g so it...

Does anyone know about the camera quality of the new iphone 3g.Heard it is bad.It is just 2mp rt? Is there a flash in the iph...

Can you get the iphone 3g on contract for 15 to 20 pounds a month if you can what can you get it on eg:o2, 3, vodafone ect pl...

regardless the price which is better in your opion >? becuase im decideding which one I want for my birthday and my mom said...

Uhm. I just bought this iphone 3g to be exact and I have no idea how to work it !! I;m looking for accessibilities on my phon...

You know the Apple iphone 3g 16gb, you know there back covers you can get it in black or white. can you change the back cover...