Big day for XML experts and their new blogs! It looks like Dr. Kay (author of the XSLT Programmer's Reference and creator of THE best XSL parser in the world) is now blogging: Saxon diaries.
If you don't use it already, you need to switch to Saxon (http://www.saxonica.com/). It is simply the most compliant, high performance parser available for processing XML with XSLT. He has also added support for XSLT 2.0 and XQuery.
Welcome to the blogosphere, Dr. Kay!