There is Zend Studio for Eclipse Developer's Guide (2008)http://www.amazon
review at : devzone.zend dot com/1275/book-review-zend-studio-for-eclipse/
online version at my.safaribooksonline dot com/book/software-engineering-and-development/ide/9780768680423
(sorry, the forum won't allow complete urls from me)
also there are some links and pdfs at zend dot com/en/products/studio/resources
Looks like an opening in the market for an up-to-date book!