I've created the skeleton of a python implementation of the obsidian portal API named "oppy".
Here's the github url: https://github.com/lhayhurst/oppy
As per the README, right now it is -very- simple: it comes with a bootstrapping program that will walk the user through the creation of their consumer key, consumer secret, oauth token, and oauth secret. The README describes how to download it, its dependencies, and run it to register your application on OP.
Stay tuned for code that actually does something with the API :-)