If you are using an iPhone you definitely use iBooks to read your electronic books or PDF documents on your smartphone. Apple has just updated the application to version 1.2.2, adding a number of important stability and performance improvements.
Aside from the performance enhancements, the new version now allows for playback of video included with enhanced books from the iBookstore. The problem of different fonts than expected being displayed is now fixed and the application overall has become more responsive especially when navigating books with many items in their table of contents. If you didn’t get your App Store notification overlay for the update, manually check or follow the iTunes link below to grab the refresh.