Rachel asked a good question:
Here's my point of view:
It's a good thing.
It means those who want an iPhone don't have to sacrifice service by going to AT&T.
It also means that Apple can put out an iPhone that can run on a 4G network, because let's face it, I bet Apple was really hoping that the iPhone 4 could have been named the iPhone 4G, but no AT&T couldn't hold up there end of the deal (during the original talk about an iPhone existing, Apple and AT&T had a little chat about how AT&T would build there network to keep up with Apple's innovation).
It means that Apple will take a bit out of the growing Android market share, which let's be honest had a lot to do with the lack of a decent phone on various networks.
It means Apple's going to roll out one badass phone, expect your world to implode.
It means that all of us who have come to appreciate our Android phones will have some serious thinking to do. It's easy to embrace Android when the option of iPhone isn't available. Will Android be as awesome as we once thought it was? Probably not. (I have other reasons for this, but that's another blog post).
Hopefully, with network alternatives it might mean that there will be a price point competition for plans. But don't hold your breath. Apple has a short lesh on the price of their products and I doubt plans will drop much, if at all.
It really means we're about to see a million more iPhones and Apple will officially begin making a huge dent in Microsofts world. With Verizon iPhones will reach the hands of millions - of Window's users who are going to get curious about this awesome Mac world and when their PC burns up (as they all eventually do), they will begin looking at our dear friend Mr. Mac.
Maybe as I'm lying in bed sick tomorrow, I'll come up with a few more things, but for now, these are my initial thoughts to help bring clarity to this very confusing world.