I just liked the idea, happened to have Pages for OS X, made a few for myself, and decided that as long as I'd gone that far I might as well share with the those that lacked the software.
The Letter and A4 sizes display almost ideally on the iPad; which is probably why they were chosen. Still, I'm sure more control of page size and layout is something Apple has in the works, but it might not be much of a priority.
Hi Poet, is there any way to get a current link to those files? I have no way to make a template for myself. The original links have now expired. Thanks, I hope to hear back from you!