couple thoughs,
MMS-maybe att requires it be done over 3g for the sake of their network, so your jailbreak over edge may work, but not an option for apple to implement on every iphone.
Ipod touch upgrade fee-Required by accounting law, but it could be $1 or $.01.
Compared to pre-software 3.0 brings hardware a year or 2 behind the pre to similar usefulness. While no multitasking, the pre has a faster chip and I hope to see some more powerful iphone hardware come this summer that allows multitasking with multiple apps open (not battery killing background processes that run when you hit the sleep button)
Voice Dialing-lots of situations it could be usefull, but while driving should not be one of them. Some studies have shown that drivers talking on wireless bluetooth are just as distracted as those holding the phone to their head, having a bluetooth doesn't stop your brain from diverting it's attention from the most important task at hand, keeping you alive when you are traveling at a velocity at which if you slow down improperly (crash) you die.
I don't know if any states ban all cell phone use while driving yet, but I hope they do. I have found myself engrossed enough with a hands free phone conversation that I am sure it limited my ability to react to changes that could threaten my life and others. I feel fortunate nothing bad happened. As a frequent pedestrian, I would like to see all cellphone use illegal, voice dial and handsfree included. If you NEED to talk while moving in a car, take a cab or get a driver. Driving is the most dangerous thing you do, nothing else in your daily life risks your life as much, OR THE LIVES OF OTHERS. Anything that takes away from 100% concentration on the road should be illegal, since I worry about many of the idiots on the road even when they give it their full 100%....