I had created a shell script to parse the headers for a few different eBook vendors so I could get a daily email with those listings. I eventually ported it to Python and made lots tweaks, but had it in a system repo instead of a public one where others could (possibly) benefit from it.
Well, here it is. I hope it's useful, but please do submit tickets for anything you see that could be improved. I'll be doing the same as I have time.