This one knocks support out of the park.

This plugin adds a new support menu link for users, as well as two management areas under the Site Admin tab.

There really isn't any specific management to this one. It's just dead simple.

Frequently Asked Questions (FAQ)

Users can view the FAQ, and also vote (yes or no) whether the question helped them or not.

For management, you can add categories, then add some questions and answers. It's as simple as that.

Support Tickets

Users need help. This gives them an option for personal attention.

They submit a ticket, and the site admin gets a notification by email. You can then head into your site, and reply to the ticket as necessary.

When the admin replies, the user is notified of the reply by email as well, with a link to their ticket. They can then update it as needed.

Note: emails are for notification purposes only. Tickets cannot be replied to, nor updated, by email.
Note2: emails are only sent to the first site admin, if you have more than one, in order to keep email load to a minimum.