Boost is still on its regular bases of updated which is great even if I can't manage to follow!
Boost 1.41.0 includes a new library called "Property Tree". This library looks great to manage software configuration files. It includes a so called XML parser which really isn't, it doesn't support SAX or DOM and most XML features. It's a look like XML reader and writer which actually fine for configuration files and cases where you control the production of XML. The XML parser it actually based on RapidXml.
It might actually replace in a lot of cases none conformed library like RapidXml, TinyXML or maybe VTD-XML. Of course, it will never become a substitute for this good old and compliant Xerces-C.