As I mentioned in a previous post, I've been working on a joint project with eBay codenamed Project San Dimas. The entire development team consists of Alan Lewis from eBay, EffectiveUI for the front-end, and finally myself from Adobe.
My role in this project has jumped around a lot since the start, but for the most part, I was tasked with working on the middleware: I was responsible for allowing our application front-end to interact with the eBay servers. So, in the end, I ended up creating the very first ActionScript 3 eBay API. I'm excited about releasing this because I will be open-sourcing it. I am a strong promoter of the open-source community and I am eager to contribute.
Anyways, the project is hosted on Google Code and, although it mentions that it is released under the New BSD License, it is actually released under an Adobe Open Source License, terms of which can be found at the top of each source file (don't worry, it's actually a more open license than the New BSD License). Along with it, I have created a "Getting Started" document to help you get your feet wet. So try it out and if you like where it's going, e-mail me to become a contributor!
ActionScript 3 eBay Library (project, group, source, documentation, "Getting Started")
Charles