CSS Anthology, 101 essential tips.
Definitive XML XSLT Web Design.
Java & XML, 2nd Edition: Solutions to Real-World Problems
XML in a Nutshell - includes XSLT & XPath, XLINKS, XPointers, CSS & XSL
XML Pocket Consultant - A good reference book, includes XSL, XML schemas, XLink and Xpath (Microsoft book)
Professional ASP.NET 1.0 XML with C#
Professional ASP.NET 1.0 XML with C#
Xml Topic Maps: Creating and Using Topic Maps.
Processing XML with Java: A Guide to SAX, DOM, JDOM, JAXP, and TrAX
The XSL Companion - includes info on XSLT and XPATH
XSLT - Shows how to convert between XML document formats
Beginning XSLT - I found this to be a very clear introduction to XSLT. It went at about the right pace for me and it had the right balance of theory and an example (TV guide) which is used through the book. There is a chapter on SVG and how SVG diagrams can be created using XSLT.