JSONQuery provides a comprehensive set of data querying tools including 
filtering, recursive search, sorting, mapping, range selection, and flexible 
expressions with wildcard string comparisons and various operators.

Quick Example:
    var data = {customers:[
      {name:"Susan", purchases:29},
      {name:"Kim", purchases:150}, 
      {name:"Jake", purchases:27}
    ]};

    var results = JSONQuery("$.customers[?purchases > 21 & name='Jake'][\\purchases]",data);

    returns customers sorted by higest number of purchases to lowest.

For more information on JSONQuery, see:
http://docs.persvr.org/documentation/jsonquery
http://groups.google.com/group/json-query
http://www.sitepen.com/blog/2008/07/16/jsonquery-data-querying-beyond-jsonpath/

JSONQuery is a superset of JSONPath:
http://goessner.net/articles/JsonPath/

Testing
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To run the test suite, simply open test/test.html in your browser.