So I have done the PHP one and am working on the JAVA one.
And I needed an AS3 implementation also.
I have again checked the library out there and didn’t like how they were structured.
I want to have control. I want to build my own URLRequest add the headers/variables I need (if any) and pass this to a signer that will then add the Authorization header and OAuth specific parameters transparently.
So I have create this one.
I will add examples, … on the wiki on bitbucket soon I hope.

I hope it will help some.