I've noticed a small problem with Calibre, with the rare ISBN number ending in X.
Instead of giving me a check mark in the ISBN column, it displays the ISBN in full. Not a huge problem, and other than that, I am in love with this program. I was just wondering if maybe I was doing something wrong, or if calibre doesn't recognize ISBN numbers ending in X?
Although not common, it IS a legitimate ISBN number...
http://www.isbn.org/standards/home/i.../isbnqa.asp#Q5