The W3C SVG and CSS Working Groups have posted the second public working draft SVG's XML Binding Language (sXBL). In brief think of this as stylesheets on steroids. The goal is to be able to render any XML document by transforming it into SVG. This would allow the rendering of things that don't look remotely like text, such as MathML and MusicXML.
Stefan Champailler has posted DTDDoc 0.0.11, a JavaDoc like tool for creating HTML documentation of document type definitions from embedded DTD comments. This release adds a DTD tree browser, an entities index for each DTD, clickable element models, and autodetection of root elements. DTDDoc is published under an MIT license.