Aside from everything else that makes the Jesus Phone awesome to own, one of the best things about it is being able to listen to WFMU live via streaming when I'm out and about and not near a computer.
If you plan to use the features that make the iPhone great (IOW, pretty much everything--except the camera, maybe), and you don't already own a first generation iPhone, buying the iPhone 3G is an absolute no brainer. People are making a big to-do about the fact that the drastically "lower" price on the 3G is a scam, because AT&T makes 3G owners pay $10 more per month for unlimited data, but if you have enough income that you can even consider buying something like an iPhone, this really is a non-issue. The value you get from using it is more than worth it, esp. now that it has GPS on it.
I was one of those nerdly "early adopters" of iPhone 1.0 (although I was not so nerdly as to camp out in front of my local Apple store) that paid $600 for the 8GB iPhone, and even though it annoyed me that Mr. Jobs cut $200 from the price a few months later, I have never regretted my purchase. I am a HEAVY podcast listener, RSS reader (Google Reader on the iPhone is awesome), and Twitter user, and I'm so glad I dont have to carry around an iPod AND a phone anymore. And the wierd thing is that I had NEVER used text messaging until I got an iPhone, simply because I never knew how to use it on any other phone I've owned.
The new features of iPhone 2.0 pretty much eliminate any of the reasons why you previously may have held off on buying an iPhone...besides, of course, the stigma of being one of those douchebag, public-finger-swiping iPhone owners (alhough you can always spot a veteran iPhone user...they only use thier thumbs to control the screen. Newbies do the index finger thing)