Deep: If there are technical questions, maybe take a couple online quizzes in some relevent tech.
But most importantly, be confident! Psych yourself up. Before the interview, take some time to relax. Play some of your favorite music to either calm yourself or pump yourself up. Remind yourself that you're awesome and you can handle whatever they throw at you. Then go forth and conquer.
Chozon: I have an old Creative V-Plus and one of those new ipod shuffles with the touch screen. I almost always just use my phone, though, since I have my entire library streaming via Google Music.