If you consider yourself as Linux administrator this post might be useful for you. NSA published some nice papers with hardening Linux servers recommendations. NSA - National Security Agency - organization that is trusted. Latest version of 200 hundred pages guide in PDF for securing configuration of RHEL5. A very detailed manual, explaining general principles of secure system, including all necessary system changes, service configuration, network security, firewall, etc..
Google did a great job with Google Maps from developers point of view. Recent V3 version of Maps API is very simple to use in projects. Recently I created an example how to embed map on the site and display custom markers on it. Markers handle mouse onClick event as well.