Hi Royce,
Getting a developer and application token allows for API access to the
production environment, but currently only with the v13 version of the
API. Access to the v2009 Beta API in production requires a separate
signup:
http://code.google.com/apis/adwords/v2009/docs/signup.html.
Both versions of the API can be used in the sandbox without signup.
Best,
- Eric Koleda, AdWords API Team