Long time Apple-industry developers, Brent Simmons and Manton Reece, this week announced and released JSON Feed Version 1. They say it best:
For most developers, JSON is far easier to read and write than XML. Developers may groan at picking up an XML parser, but decoding JSON is often just a single line of code.
Our hope is that, because of the lightness of JSON and simplicity of the JSON Feed format, developers will be more attracted to developing for the open web.