Hi Noxin - I had started writing a collections manager in Python that would run across Windows, Linux and the Mac.
I didn't get too far - but did managed to map the SHA1 hash's back to the original files in each collection (bar .azw files that didn't conform to the -asin -type convention).
The tool had a v. simple two pane layout with Kindle docs on one side and the current collections on the other. I had drag and drop working to add to existing collections, but hadn't added an option to create new ones.
Heres a quick screenshot ...
I was doing this more out of fun than anything else (I have an new DXG), but would be happy to collaborate on something together if there was demand. Who know the next firmware release could kill collections all together.
Rgds
Kitard