It's all about $$$ what % of Poser owners would buy the book? how many copies of Poser 4 are in existance? you just can't compare photoshop to poser. there are probably about 100 copies of photoshop out there for every 1 copy of poser. what are the chances that the book you publish today will be killed by ver5 coming out. GOOD if you put the work in today to put out the book how much work will be needed to upgrade the book for ver 5? Now if you're talking about a low dollar all acrobat or html book fine but the chances of getting one into print are nil.