i would just like to see the battery life on the iphone to be extended a bit.
and also as a firefighter/emt i hate the fact that you can't set 1 (or 2) contacts to be called when your phone is locked, ICE - In Case of Emergency.
having an iphone myself the first thing i did was set a password because every password from mail to who knows is on your iPhone...
So if you would lose it your screwed.
but now the only access to the phone is to make an emergency call, no ICE call.
everyone should probably enter a the number of the person who should be called in case of emergency so your family / loved ones can be contacted when something has happened to you. (or ask additional info about the you)

with the iPhone, you can't