Thanks for the comments everyone. The "fellow" is female, by the way!

Just to clarify, I wasn't thinking at all about using anything in the actual courtroom. I don't think it's allowed anyway, but I certainly would consider it my responsibility to listen to the judge, trial proceedings, etc. (I also was in a courtroom once where the judge specifically told us not to take notes.) In most courtrooms I've been in, we weren't even allowed to read the newspaper while waiting to be questioned as prospective jurors. (But I'm thinking perhaps I can get away with a peek at some song lyrics I want to memorize, if I put the paper in my bag and just look like I'm rummaging around for a cough drop or something!)

I was instead thinking about the time spent in the general waiting room, while waiting to be called into a courtroom, and that can be a considerable amount of time. People are allowed to read and talk in there, so in theory it seems using an iPod with headphones shouldn't be a problem. It may be a security issue, however? Interestingly, it does say that laptop computers are allowed. I haven't called yet, but if I get a definitive answer, I'll post it here. Thanks anyway for your interest.