Custom columns:
- Price
- Credit (amount paid from settlement credit, google credits or random kindle credits - i.e. free money

)
- Word Count
- Publisher Imprint
- Last Read Date
- Rating (in addition to the star rating)
- Source (who I bought it from)
- Backlist (Y/N column to flag self pubbed backlist titles previously legacy published)
- Shelf
I only have 1 library with several virtual libraries. The "Shelf" column is heavily used with my VLs. It's a pick list that is a super group of my tags: Contemporary, Category, Erotica, Paranormal, Historical, Other, Freebies and FINISHED. If a book is on a shelf other than Freebies it is a higher on my TBR pile. If I ever get to the point where the main shelves are empty I'll repopulate them from the Freebies shelf. After I read a book I change the shelf to FINISHED. One of my VLs (Unread) is set to show everything except where Shelf=FINISHED.