A number of the external links are not valid. On the page "Patterns and Pattern Languages", the links entitled "Systems Reengineering Patterns", "GOF UML models", "Links on Patterns in Delphi", "Class Object Pattern", "Patterns of Software Reuse", "Programmers' Canvas", "Software Patterns -- IAP'97", "Design of Business Information Systems", "Les Patrons et les Langages de Patrons", "Design Patterns for Avionics Control Systems", "An HTML 2.0 Pattern Language", and "Steve Berczuk", i.e. eleven out of thirty-one links on that page. In fact there are a number of bad links on almost every page I visited. For a site devoted to providing access to external sources of information these invalid links are a problem.
The FAQ (Frequently Asked Questions) section contains the reference "See To Kill a Singleton", but has no link attached to the text. Using the site's search tool to look for "kill AND singleton" gives four references, one of which is the FAQ page, another is a reference page to an invalid link, and the last two do not explain how to kill a singleton.