To give denizg some credit, there are things I am missing. In a descending order by priority -
1) A resistive touch-screen with a stylus for better accuracy;
2) A hardware keyboard or at least the cursor keys (the latter very badly);
3) A swirl-to-zoom gesture;
4) A home screen with shortcuts and widgets;
5) A camera lens cover;
6) A normal SIM card slot rather than the micro-SIM abomination;
7) An SD card slot.

All except #3 and #4 are hardware limitations though. I have yet to find what apps I might want that are not available in one way or another.