Paul Lamere comes up with some great lists Amazon could create with data about reading status in Kindle. Some examples:
Most Abandoned - the books and/or authors that are most frequently left unfinished. What book is the most abandoned book of all time?
Read Speed - which books/authors/genres have the lowest word-per-minute average reading rate? Do readers of Glenn Beck read faster or slower than readers of Jon Stewart?
[via kottke]