So... is this a scam?

That's the exact format as the one I received when I won so I'd say its legit..As stupid as it is, they do ask for that information when you win.

From personal experience, I gave them all the info, and got my Dell XPS just fine... which reminds me... I STILL DIDNT GET MY T-SHIRT >=(

You got a fricking computer, and you're complaining about a T-Shirt? >.>

There's still a chance that the email is spoofed- I wouldn't reply until I got a positive response in the ticket you sent.