I just finished scanning some old two sided hand written notes into two pdf files. Specifically I created 'odd.odf' for odd numbered pages (e.g. page 1, 3, 5, ...), and 'even.pdf' for even numbered pages (e.g. page 2, 4, 6, ...). The below script takes these two files, and uses pdftk to merge them into a single 'result.pdf' document.

Below are some tutorials I dug up for a someone I am working with. They bring back some great memories, and seem pretty useful, so I figured I'd make note of them.