thanks for wanting to contribute!
you can subscribe under http://www.arduino.cc/playground/Main/LoginForm
you can find it in the
right menu > PARTICIPATE > request contributor access
can you see it?
it's a pity if people can't contribute because they can't find registration form....
what do you think of the name? is "request contributor access" a bit strange?would you have understood it better if it was called "request login" or "register" or "get username and password"?
the feedback and help on this from all the community is importat to do a better job.
now for your contribution:
look under the "interfacing" menu
there is already a section about Arduino + Directorhttp://www.arduino.cc/playground/Interfacing/Director
You can add all your contributions there
thanks again for contributing
and please don't hesitate to ask again if you have more problems
you can write to me at firstname.lastname@example.org