I have the module available in Mx 6.x, haven't found the time to upload it to the app store though. Runs in production without issues. Send me a mail if you need it, and I'll try and upload it to the appstore as soon as I can.
Mike, do you mean the Open Authentication Module from FlowFabric?
I've used it in a test setup with if i recall correctly was a Mendix 6.x version. I don't have production experience with is, since we've choosen to use a solution based on SAML.