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2008
JSONLint - The JSON Validator.
So many JSON on the web are invalid today (blogmarks.net api included). Save a kitten, validate your Jsons, produce it with a decent library.
2007
xml2json-xslt - Google Code
(via)xml2json.xslt is a XSLT 1.0 stylesheet to transform arbitrary XML to JSON. There is also a version for javascript. The workings are demonstrated with the accompanied xml files. The target of this library is to create javascript-like JSON (Parker convention), not XML-like JSON (see the BadgerFish convention).