From Simon St. Laurent: Monastic XML, An ascetic view of XML best practices.

MonasticXML.org is a look at XML from a different angle, focusing on what markup is best at rather than what markup can do to solve a particular problem or set of problems. While XML is powerful, developers seem insistent on using XML in ways which seem convenient for a moment but which cause much greater trouble down the line to both their projects and to markup itself.