Just saying, but having an open kernel doesn't prevent Apple's user experience. If Apple were to post their source code to apple.com right now the iPad's user experience would not take an immediate nose-dive due to the universal law that "open source != good user experience." Please don't act like freedom and good user experience are mutually exclusive.
For example, I just read a most interesting exchange on a board, where one guy was going on about how the video experience sucks because there's no DVD drive - it's completely missing the forest for the trees, getting hung up about a single insignificant detail that's at the very best a nice-to-have. This sort of tunnel vision prevents the broad view required to execute this sort of device.