I would love to see a single, device-agnostic format to emerge instead of more lock-in.
You can always use Kindle and submit to them? Apple are obviously going to support their own platform out of the gates, and that makes complete sense. The same reason Amazon only support Kindle for books, Windows only make Internet Explorer for PC, etc, etc. It's how it works.
iPad is not just a device, it is a platform; and that is where it comes in. It is also a platform that schools are acceptive of, as it has been showcased as an education device. iPod Touches have the word iPod in the title, and iPhones are phones; schoole don't like iPods or Phones.