When I did a recent integration, I found myself a little confused on the authentication documentation page which showed OAuth as a "New! Nov 2010" entry, but on the same page showed a "SUPPORT RETRACTED" entry for OAuth. The latter entry seems to be from 2009.
After seeing a few recent references to OAuth here, I'm wondering - is it a legacy authentication (like Digest) for which support has been retracted, or is it fully supported/encouraged for new integrations?
At one point we did roll out OAuth and then retracted it. However, we are now officially supporting it and encourage new integrations to use it. If you have any questions regarding it, or run into any issues, please let us know by posting here on the forums.