MBB,
I took my XBox to Orlando last year for a business meeting (yes my business group is a little strange, playing Xbox until 2 AM every night). I had a carrying case for it and it definitely registered on the Xray machine as something to look at (got extra attention both ways). After I told them waht it was, the attention given to it was similar to my laptop computer, they would take a swab across it and put it into the analyzing machine. It wasn't that big of a deal really. I hope this helps.