I've been using a simple jQuery wrapper framework for Facebook's Open Graph API for a few years now. It's something that I wrote, and has been improved upon over the past few years. It started off as just the basics, and has grown as the requirements have grown with various projects.
This API wrapper has been written for my own apps, and used extensively. That doesn't mean to say it's the best, most foolproof way of doing things, it's just how I do it. I've open sourced it on the off chance that someone else might benefit from it, as well as for feedback, advice, suggestions and recommendations on how to improve it. Hopefully it'll come in useful for someone!