The Recent Site Activity section provides administrative access to a history of all recent changes to the website. It includes such things as page updates, attachment additions/deletions and comments. It does not include such administrative changes as Sharing and changes to the Site Layout, Theme or Colors and Fonts.
This information is available regardless of whether or not the Recent Site Activity gadget is present in your site's sidebar.
The Pages feature provides a listing of all pages in your Google Sites website. For each page, Google Sites lists the name of the person who created the page, along with the date and time. The same information is provided for the most recent page updates. Finally, the number of revisions is listed for each page.
By clicking on the number in the Revisions column, Google Sites displays all revisions for the selected page. From here, you can revert back to previous versions, if necessary.
The Attachments feature provides a central location for managing all files that have been attached to each page of your Google Sites website. This feature provides the following controls over attachments across your site:
The Sharing tab (also found under More Actions >> Share This Site) provides site Owners the ability to define exactly who can view your Google Sites website, and with what permissions. The following options are available:
For website Owners who wish to generate revenue through their Google Sites websites, the Monetize feature provides a direct integration with Google's AdSense program. See Enabling AdSense with Google Sites for more information.
The Web Address tab is where website Owners can perform the Google half of the web mapping process. If you would like to allow visitors to access your site through a custom URL (www.example.com) rather than the default Google Sites system URL (sites.google.com/site/mysitesguide), this is an important screen for you. See CNAME, Alias, Mapping... How does it all work? for more information.
Additional Image: Change Site Layout
Through the Colors and Fonts tab, website Owners can configure the look and feel of their Google Sites website. You are provided granular control over elements that, when changed, have a global effect. The primary areas of the site that can be modified here include:
Changing your theme will discard any changes that have been made in the Colors and Fonts administrative section.
Note: If you are looking for pre-built templates (such as ones to match the Google Sites example websites), none are available at this time. To build a site that matches these examples, or others, you will have to manually reconstruct them or contract with a service provider to do the work for you.