IBM's alphaWorks has released the XQuery Normalizer and Static Analyzer, a "Java API and GUI for normalizing and computing the static type of XQuery expressions."
Apple has posted Security Update 2004-04-05 for Mac OS X 10.3.3, available through Software Update. I don't normally announce such things here, but among other fixes this release includes a new version of libxml2. I'm guessing it fixes this buffer overflow attack on the URI parsing code in nanothttp and nanoftp.
Engage Interactive has updated two open source XML parsers written in PHP. SAXY 0.8.1 exposes a SAX like interface. DOMIT! 0.9.2 exposes an API based on the Document Object Model (DOM) Level 1. Both are published under the GPL. These are bug fix releases.