Just like the iTunes app store, the iBooks app on the iPad spotlights the Top Paid (and Top Free) books within each category. Here are some charts that compare the average price (by rank)1 across the major categories. The average price of the Top 50 titles across the major categories range from $7-$15. Cookbooks, History, Biographies are slightly higher priced, while Classics, Romance, Sci-Fi, and Children/Teens have lower average prices.
[Click HERE to enlarge.]
[The equivalent graph for MEDIAN prices can be found HERE.]
(1) Data for this post is from 4/15 through 4/20/2010. Average price is based on titles that appeared among the Top Paid apps for a given category during that period.