I have been reading the Saxon Diaries for a few days now. Every since I read an article on Saxon architecture, I have been fascinated by this product. For some of the xml applications I am working on, XStream seems to be a good fit. I need to investigate this further.
These benchmarks look impressive.
While XPath, XSLT and XQuery will be the mainstream languages, performance intensive applications may start using some of the more specialized streaming processors.