Here is a requirement that want to batch dump xmp from PDF to xml file or Database,

I’d like to know if you have developed or if you can develop an application for extracting customize XMP from PDF documents.
I’ll try to be more relevant: I customized a specific card for additional metadata in Acrobat Professional. If [...]

It is just a article talks about my two softwares posted by JimmyZou on http://www.mobileread.com/forums/archive/index.php/t-10515.html

After google a lot, I find super fast tool to cut A4 pdf into double pages A5 file.
I did one, and attach it behide, you guys can check it out.
Using DOS command to do it, and it done very fast, I [...]

I think it is a interesting requirement about PDF and ebook, so I quote it here,

Many computer users have thousands of digital photos (aka pictures, images) and so, they need a tool like ACDSee or IrfanView or XnView, this is, a Photo/Picture/Image quick/rapid viewer/browser/explorer Rather than manually click on each picture to launch a [...]