I just wanted to highlight Jennifer Chappell's excellent article at TreoCentral. Jennifer is the editor at TreoCentral, and usually uses a Treo 680, much like I once did. She's been taking the iPhone through its paces, and her excellent first look article is now up.
p> This review is more relevant than most out there, as iPhone owners were 10 times more likely to have used a Treo prior to the iPhone. I got bitten by the iPhone bug, and bitten hard. Using a Treo in the next week or so is going to be interesting.