From a fellow blogger:
EDIT: Try SUNROCKX (without the #) as well
A resource for the current Sunrocket Gizmo Administrator Passwords for the AC-211-SR, AC-211-N, Innomedia, and Linksys Gizmos. This blog also contains instructions on unlocking and reconfiguring your Gizmo for use on other VoIP providers, now that SunRocket has shut down. If you have any suggestions or new how-to's that you would like included on this site, please email me at email@example.com.