For those that can't get the iBook, would be nice to update the tutorial and make the screecasts available.
+1 itunes on linux is not exactly a love story
+1 this too. Out of shear desperation I downloaded the .ibooks directory and can watch the videos on other OSes, but cannot figure out a way to view the book any other way. If you're using IBA to construct the book, can you not export it as PDF?