Could be Bookworm Girl. The other thing I noticed when I crashed mine while trying to organize books and download from the store was that I pressed too many things too quickly. I'm gonna guess that it couldn't handle everything I was doing and crashed. I found when I was more patient and slowly selected my 28 books to move to a collection it worked fine.
When I went around and clicked quickly it crashed. I think if it's too much for the OS to process it just crashes. I have to remember to pause after making my selection to allow time for the system to register my selection.