The newest update of iBooks version 1.1 is now available for iDevices (iPad, iPhone, iPod Touch). Probably it is the semi-official ebook reader for iPad even is now available for iPhone and iPod Touch.
The iBooks 1.1 hot key feature is now .PDF support. This makes iBooks and iPad the real ebook reader.Unlike GoodReader, Up until now, iBooks only used epub format books, which is not the most most convenient or popular ebook format. But Apple has also added new bookmarking, passage highlighting, and note taking features in newest update of iBooks 1.1. Using iBooks 1.1 users can also open and read PDF documents from Mail, and save them to library.
Download iBooks 1.1 Update
As the iBooks 1.1 app is now available, iPad users can grab it directly via Apple App Stores. But iPhone and iPod Touch users have to run iOS 4.0 on their iDevices.