The iPhone is tantalizingly close to my perfect device. I wanted it to replace three other gadgets that I used regularly: my 60gb iPod video, my Dell Axim x50v, and my ancient nokia cell phone.
The iPod and phone are no-brainers. I've also always wanted a GPS, so that's a bonus (even without turn-by-turn directions). I was a little hesitant about the move from 60gb to 16gb, but I can live with just a subset of my library, and Pandora more than makes up for it. The sticky point is the Axim. The iPhone needs a few things to be able to satisfactorily replacece my old PocketPC:
Birthday and Anniversary Notifications
The fact that it doesn't do this is, quite frankly, idiotic. You even have to jump through hoops to ensure all your birthdays and anniversaries show up in your calendar. The iPhone is broken until Apple does something about that.
File Management
Really, Apple? A device with beautiful image and text viewing and zooming abilities, with a full web browser, image browser, and PDF viewer—with no way to sync eBooks, images larger than 640x480, or PDFs? WTF? Fix plz.
Space Trader
Funnest mobile game ever. Nuff said.
Also! A night sky astronomy app that let you take a snapshot of the sky, and used the GPS and data service to identify the stars in the picture to tell you their names would kick ass.