From a programing and systems background I like the compactness of JSON (as opposed to XML), but until recently felt that it didn't have the same weight as XML. I was pleased to hear potential development partners suggest it as a data interchange.
I've consumed JSON'd data on the National Rail website with an Android App.
With PHP I've used:
With JAVA I've used:
This link is useful to "decode" serialised JSON data: http://chris.photobooks.com/json/default.htm
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