For those of you already with ATT, on their iPhone page they have a link up now to check if you are 'eligible' for the upgrade discount: http://www.wireless.att.com/cell-ph...?wtSlotClick=1-0013IU-0-1&WT.svl=calltoaction The 3G wasn't a big deal to me, though once I thought about how it will probably be integrated into a lot of the applications coming to it, I realized it could be pretty major. The GPS is a big plus in the new one IMO.
If you're in a Union, you can get 10% of the monthly service fees of the iPhone (or any other AT&T) plan.
There are all sort of discounts that ATT& has for employees of specific places. I get 10% off because I work at the university, my siter gets 10% off because she works at the hospital, etc.