Apple has posted instructions on getting your $100 store credit if you are an iPhone early adopter. Start at this page:
http://www.apple.com/iphone/storecredit/
You'll first enter your phone number & iPhone S/N. Then they'll send you a text with a special code. When you enter that, it will generate a page with a credit number & PIN. Those can be applied in the online Apple Store, or you can print the page (which includes UPC scan codes as well) and take it into your local Apple Store to use.
It only took about 3 minutes from start to finish to get my credit. Quick & easy. The hardest part is figuring out what to spend it on. The new Logic Studio is mighty tempting...
