We'll just have to keep harassing nick for a new program to change categories.
I also have a storage system, and within that structure I use categories quite extensively.
Since I can't load /all/ my books onto the device at once, I have to use some categories with numbers so I know if I have read the book, and when I read the book I edit the title and add the date there.
Huge pain, but I am so scatterbrained I need some type of system. I just wish I had the time to devote to coding now that I did in the BBS days.