Just had the JSON lightbulb come on for me. I've been doing quite a bit with Python, and using Python pickles to pass data between various processes. It's awful convenient, but the language-dependence is a bit bothersome.
I've also been using Spread for inter-process and inter-machine communications, and using JSON should be much more flexible. I've always wanted to write an Apache2 module to send logging info over spread to Python scripts, but having C code generate Python pickles looked nasty. There's a nice, simple, C JSON library that should make serializing data in C to be read in Python a piece of cake.
I realize that there are already Apache modules that feed info into spread, but standardizing (at least for myself) on JSON objects as a Spread message format should be much more flexible.