Don't attempt to delete them from the directory manually. I've had problems where they remain indexed and you can't get rid of the listing short of factory resetting the device. But I'm using a Touch, which has very different firmware from the others. If you want to delete all of them I'd just factory reset the device.
Reregistering is easy, but I'm not sure what else besides notes that you might want to save, nor how to do that if you do. Also, if you paid to get the ads removed, you won't have to pay again. I think the device remembers, but it may have to do with re-registering. I didn't pay close attention when I did it.
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