Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Publish New "Apple In Education" Video / Commercial
Following Apples announcements today. They have released a video/commercial which very simply explains what all this iBooks 2.0 is about. The video to me comes across as more of an iPad 2 sales commercial then promoting the textbooks.
You can watch it HERE