Google Docs and Google Sites get version history and better sharing options
You can access version history in Google Docs by choosing the "Add or manage versions" option on any file. That will let you upload a new version of the document or recover a previous version from the history. The settings for adding drop-down menus to your horizontal navigation bar in Google Sites can be found in more actions > manage site > site layout.
As far as sharing settings, Google Sites now has the same privacy options that were added to Google Docs over the summer. You can share your sites with everyone, anyone with the link (this option will keep search engines from indexing your sites), or just the people you explicitly approve.