Here is the json.org description(LOL) and I couldn't agree more:
JSON: The Fat-Free Alternative to XML
Here you find there are Json libraries for almost all languages.
http://www.json.org/
Json is so easy with Jquery http://api.jquery.com/jQuery.getJSON/
One of the best texts I've found about Json http://ascherconsulting.com/what/are/the/advantages/of/using/json/
Because JSON was designed for the
purpose of serializing and
unserializing data being sent to and
from JavaScript applications, the
advantages of using JSON relate to the
advantages of JSON over other means of
serialization. The most well-known
means of serializing data for
transmission to and from applications
at present is XML. Yet, XML is a
rather cumbersome means of
serialization. First, the sender must
encode the data to be serialized based
on a document type definition that the
recipient understands. Doing so
creates a great deal of extra padding
around the actual data no matter which
DTD is used. So, the size of XML
documents is often fairly large in
comparison with the actual set of
values they contain. Second, the
recipient must receive the stream of
XML and decode the data in order to
then put that data into memory. In
comparison, the serialization of data
using JSON by the sender is relatively
quick and compact because the
structure of JSON reflects the
structure of standard programming data
types and the encoding mechanism adds
only the minimum number of characters
required to indicate the structure and
value of the data. Once the recipient
receives the JSON serialized data,
then, the only processing needing to
be done is to evaluate the text of the
string using either JavaScript's
built-in eval function or a compatible
function in another language. The
other standard comparison is YAML,
which is able to serialize complex
data sets without relying upon a DTD
and needs a simpler parser to both
read and write than XML. However,
even the simplified YAML parsers
generally require more time and
generate larger serialized data
streams than JSON.
