Apple yesterday updated its iBooks application for iPad, iPhone, and iPod touch yesterday to add similar functionality, as well as several other enhancements.

- Double-tap an image within a book to view it in greater detail.
- Experience books that include audio and video.
- Enjoy substantial performance improvements when reading PDFs.
- Look-up definitions to English words inside books without a specified language.
- Addresses an issue that may have caused some book downloads to not complete.
- Includes many stability and performance improvements.

The iBooks update comes alongside iTunes 9.2.1, which brought several minor enhancements to the company’s media management, playing, and syncing application.