I got the refund from AMEX too, was totally not expecting it since they don't have to do anything, but it is one of the reasons I use AmEx for all of my purchases. I am surprised AmEx did not try to get some PR out of this, they deserve it.
As to the people who are saying we are taking advantage of the system and how can you sleep at night, give me a break. If anyone should be losing sleep from guilt it should be Steve Jobs. This was all planned from the beginning. Apple made a RIDICULOUS profit margin from the early adopters, dropped the price 33% and let everyone scream for a couple of days, then offered a $100 store credit, knowing full well almost everything in their store is well over $100, meaning that people with that credit will end up putting more money into Apple. It is a devious and brilliant marketing technique to screw people over and come out smelling like roses with a hefty profit. Microsoft needs to bow down to the new greedy evil empire.. Apple.
BTW, I am not anti-Apple, I think they are an amazing company product-wise, it just seems like some of their practices could be viewed as a little shady.