Apple announced the iPhone today, and it's brilliant (no, I don't work for them or own their stock -- though the latter may soon change). They waited a long time to bring this out because they wanted it to be perfect. It's awfully early to say, but it sure looks close: bombproof OSX (which means full Address Book, iCal, etc.), fantastic interface, brilliantly thought-out design in every respect (watch the little films on the site: http://www.apple.com/iphone/). Everything that makes the iPod the gold standard in music players and more.
I switched to Macs five years ago and wouldn't go back to Windows at gunpoint. The day this phone comes out, I'll say goodbye to Palm. I've loved my 180, my 650, and my 680, but the iPhone will be to everything else what the Treo has been: a better, more powerful tool. And it will be supported by a company that gets how important the relationship with the customer is.