I got my stamp today in Houston, here are the key points I want to make:
1. Arrived on Northpoint at 7 am, I was in line to get a number until 9 am, completed the process by 11 am.
2. DO NOT bring camera phones. I had my Treo 600 hoping that I can read and send email during this time, they made me go back to the car, I lost at least 20 numbers because of this delay.
3. My passport was expired so they asked for a 3rd photo that was placed on a temporary card that looks like a I-94 and stamped with the standard message that otherwise would have been stamped on the passport.