Hi Jonas, It is great to write (...and to read..too) book on JSF+Ajax.
Ajax has started to catch market. Thanks to the Google and the some of the other web2.0 startups. I hope one will definately learn the both using your book. The JSF has been made standard tech in j2ee specs, but there are a lot competitive (existing) technology (Struts/Spring MVC/ Webwork/ etc..), so I am not sure, if in future it gets its due respect/values in the java space.
I wish, more people to know it, and use in their project(s).
Wish you all the best, and thanks for writing on such a good topic !!