The JSON Feed format is a pragmatic syndication format, like RSS and Atom, but with one big difference: it’s JSON instead of XML.
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.
This is such a good, simple idea. In general, I hate dealing with XML (I actively bias against SOAP interfaces too). JSON isn’t more verbose than XML, but is decidedly easier to read, and far less fragile. I’ve added JSON feed to this very site.