I hope you guys are having fun playing with our APIs. To make things a bit easier, here is a Java library that you can use that takes care of all the nasty authentication and XML formatting bits. It could also be of use as reference for those of you developing libraries in other languages. Consider it alpha code, and feel free to fix any errors you might come across.

There are a few dependencies: commons httpclient, logging, codec, and json.jar.

Coming soon, the ActionScript library. But remember, this is all REST-based, so don't let the unavailability of a library get in your way. Can't wait to see what you guys come up with!