List all Google Sites you have access to (Google Apps admins can list all sites on a domain).
The add-on Sites Catalog will list all the Google Sites a user has access to. Google Apps administrators (full admin) can list all sites that have been created on their Google Apps domain. The Awesome Table view option can also automatically create a view on http://www.awesome-table.com/ that will display a nice listing catalog of all the site results list.
This is especially useful for administrators who wonder how many sites have been created on their domain and for users who want to know how many sites they have access to.