I recieved an email from IDG expo's telling me about the upcoming Macworld Boston and how to obtain a free exhibit hall pass. However, when I tried to register with the free exhibit hall pass code (which was given in the email) it still required that I enter in credit card infromtaion (which I don't have). Has anyone done this before? Do you have to buy the pass and then they refund your money? I hope this is *truly* free, not some sort of rebate...