Ok, last one for now!

Here's a VERY useful use: photo-copy.

Imagine taking a snapshot of a page, and having the library calculate the correct orientation, and compensating for page colour and lighting across the page, and then possibly running it through an ocr. Despite the page being bent (think thick book), or the lighting being different across the page (also thick book), or a slightly skewed angle (quick snapshot), the pages true orientation and colour could be found, as though it was a single, flat, colour-photocopied page.

This would be tremendously useful for snapping notes, business cards, reference pages, magazine pages, handouts, brochures, etc. Combine them with a tool like xournal and an upload engine, and you have TRUE magic.

Of course, something like this could be contained in an app, but it would be better to contain the functionality in a library, and then build the app using the library, so that many other developers can use the CP framework in weird, wild ways.

}:^)~