I contacted OpenFeint about the supplying a plugin for Unity to work with Android. This was there response
Is the Unity team working to add this support? How long do you think it will be till it is added?
In my experience, OpenFeint.1.0.1a is compatible with both Unity 3.0 (requiring an apk unpack and repack with the proper assets) and with Unity 3.1 (though it’s not a simple “plugin” experience like iOS is). OpenFeint.1.6 does not seem to work. To see their explanation of what is happening seems to jive with where I got stuck in my 1.6 implementation. OpenFeint was looking for specific elements in the xml layouts, but those elements are just missing for whatever reason.