The first release version of the SoundCloud AS3 API wrapper is now available on github. This library enables your Flash or Flex projects to communicate with SoundCloud’s API to upload tracks, create playlists, edit user info and so on. It handles all the complicated OAuth authentication in the background so you only have to deal with a few simple methods. The project is still work in progress and needs some more testing, but I think the API won’t change anymore so you can definitely include it in your projects.
I’ve also written a little Quick Start Tutorial on the Wiki pages and put a sample AIR application in the download section that will hopefully help you getting started with the API.
Some features are currently only documented in the code comments, e.g. switching the response format between JSON and XML. I hope to find some time soon to set up a proper ASDoc documentation.