I feel the iPhone is more general audience
The iPad is much more younger adult and older adult orientated
The iPod touch is much kid like orientated... And music lovers
I beg to differ...
iPhone is older teens/adults. Older teens who have jobs can pay for it and so can adults. Most parents won't pay for a $50+ monthly plan.
iPod touch is pre-teens and teens. The base model's price is affordable to most parents and can easily please thier teens with music, movies, games and more.
iPad is more older adult and younger children. The big interface makes it easy for the elderly and young to work with and most pre school games and much better on a 9" screen compared to a 3" screen.
Saying the iPod touch is for children is like saying "Steve Jobs uses Windows"
On the second class topic, yes iPod touch users are not treated equally. Until recently, iOS updates (major ones) costs ten dollars for iOS 2 and 3, five for iOS 3.1.X
The thing is, if you are in the US, AT&T's 3G is so scattered, Wi-Fi would be better. In Canada, Rogers' and Bell's 3G network are like Wi-Fi on the go (not to brag).