perhaps you should try Jeni Tennison's Book on XSLT, she has a blog
(Jeni's Musings) and her writing style is easy to understand, she
breaks down complex things as if they were so easy it's a joy:
Beginning XSLT 2.0: From Novice to Professional
take a look at her homepage if you like:
http://www.jenitennison.com/xslt/