Is this the category for iPad's iBook eBooks?
No. iBook under the notebook category refers to Apple's pre-MacBook consumer notebook series that was available from 1999-2005. For the ebook reader application used on iPads, please visit:
https://discussions.apple.com/community/app_store/ibooks
for user to user discussion.
10.7.1 iMac 5,1 MacBook Pro 3,1-OTHER, Mac OS X (10.7.1), - * Links to my pages may give me compensation.