Here are some JSON related articals and links:
http://www.ibm.com/developerworks/web/library/x-xml2json/
Summary: The use of JavaScript code to add interactivity to your data-driven Web applications is hot nowadays. If you can encode your data as JavaScript Object Notation (JSON), you’ll simplify its use with the JavaScript language. Discover different approaches that use XSLT V2 to generate JSON from XML data.