- iTunes music syncing, especially due to my huge quantity of Smart Playlists.
- DRM music purchased via iTMS.
- Polish. Mostly software/system polish.
- The tracking with my finger (like during pinching) is super, much better than with the Samsung Vibrant.
- Apps. There are some seriously good apps on the iPhone. For example, Soulver.
- Syncing with OS X Address app.
- Syncing with Safari (though I don’t use this syncing much at all and I don’t use Safari much anymore).
- Syncing with iCal. I think BusyCal will handle this just fine via Google Calendar sync. And it might be more over-the-air than it is now, which would be great. No need to buy annual MobileMe to get OTA syncing.
- An investment in cases. No big deal.
- Great mute button on iPhone.
The Samsung Vibrant looks very promising but for the points above.