This seems useful for certain people, but users only have access if they're signed up on your blog?

I would love to see this extended to offer a complete support ticket system. A frontend widget and a way for the admin to respond from the Dashboard or email, as well as for users to track their support tickets. I know, I know...I'm suggesting a lot:)

To date, I've been using osTicket for my support ticket system. I would love to see a WP integrated support ticket system.

EDIT: Looks like there are few, this seems to be the most recently updated: