I’ve been working on a project that I can hopefully talk about a little more soon, and trying out JsonFx in the meantime for some server-side JSON serialization and deserialization. Rather than extol all of it’s virtues, let me just say this first and foremost; it’s very solid. I’ve put it through it’s paces and it’s been perfect. It has an extremely favorable license, and finally, the code looks pretty nice too.
It also has an XmlSerializer-esque set of APIs (i.e., one can use .NET classes as inputs and outputs, rather than extract or construct the structure of the data manually.
Good luck to those guys. Rock solid, open source code is a real treat when you find it.