‘The solution we've used is to build a presenter for each model, solely responsible for building the json.’

A walkthrough using RABL.

‘MessagePack is a binary-based efficient object serialization library. It enables to exchange structured objects between many languages like JSON. But unlike JSON, it is very fast and small.’

‘CSS-like selectors for JSON.’

Someone in the audience at Ruby Manor mentioned this. It’s a library to simplify handling web services.

Looks genuinely useful: give it a resource URL, and it will tell you how to embed it into your page.