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set ServerSignatures Off - Removes footer information from default apache pages. For example, page not found.

Optional Optimization

I found that you can save quite a bit of memory (to put results here) if the status apache module is disabled,

sudo a2dismod
Your choices are: alias auth_basic authn_file authz_default authz_groupfile authz_host authz_user autoindex cgid deflate dir env filter jk mime negotiation proxy proxy_http rewrite setenvif status substitute
Which module(s) do you want to disable (wildcards ok)?
status
Module status disabled.
Run '/etc/init.d/apache2 restart' to activate new configuration!
sudo /etc/init.d/apache2 restart

That is for now. I might flush this section out a bit more later. Surprisingly, the default Apache configuration is very robust that I rarely need optimization. Instead, we focus optimization efforts on application servers which usually give us the biggest improvements.

References

http://cloudservers.mosso.com/index.php/Ubuntu_-_Apache_configuration#Security_Settings - Rackspace wiki on hardening Apache Web Server.