I traded in my 3G for a 3GS the day the 3GS came out and I can tell you the number one difference for me is the speed of the phone itself. The speed that you can open and close apps is vastly different.
I would have to say that I don't think webpages download any faster though. However, you can pull up multiple sites and switch between them quite a bit faster.
If I were you, I would make the switch, jailbreak your old phone, and sell it on ebay for $400.
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