Thinking about entering the iPhone market or upgrading from an early version? Here is an interesting side by side by side by side comparo of the iPhone 2G, 3G, 3GS, and 4. While very unscientific, you can get the point pretty easily. There is no indication as to what version of the os each phone is running, but if you were considering spending the cash for the 4 or saving a few dollars (or avoiding that whole antenna thing) by getting the 3GS, this video will give you a decent real time comparison of the speed you’ll be giving up by saving the cash. You’ll need to decide which you want to give up, speed or cash.
Thanks to Gizmodo for the article.