I see no reason for student to carry laptops, iPads, etc. around at high school. Heck, I'm in college, and I have maybe taken mine to class 5 times over the past two years, and not at all this year. 95% of the time they are only a distraction (facebook, youtube, games, etc.) and aren't really relevant unless you're trying to take notes in a history class.
I wouldn't support a ban on iPods or phones, as everyone has those and they wouldn't really be able to do anything about that, although phones in class can be pretty obnoxious.