"Working through Screens" available as a book

"Working through Screens" is a remarkable achievement.  Jacob Burghardt of Flashbulb Interaction has produced clear, elegant material that supports the difficult bits of designing user interaction.  I haven't seen anything that even tries to cover the same topic.  In addition to being available as a .pdf download, it is available as a Lulu book.  Do have a look and buy the book. Well worth the investment.