Something cool about the SPG AmEx (wasn't on the older Blue version) is that it has a RFID chip in it where you can simply TOUCH it to the credit card reader at places marked with "ExpressPay." I have used this so far at:

Jack in the Box
CVS Pharmacy

I only saw a brief mention of this in the SPG AmEx master thread so I thought I would point it out.

When buying something at CVS yesterday a woman with the same red SPG AmEx had to swipe, accept, then sign while I just touched it, was handed the receipt and walked away--pretty handy to not sign, swipe, accept, etc!

Of course, I'm sure the "cyber-thieves" of the future will simply brush against your back pocket with an RFID scanner and grab all your account info wirelessly!!!!