Bear with me as I just decided to create this forum and will begin building a topic list.Lets begin with a collection of helpful links, which I will be adding to very shortly.

Vulnerable Extensions List
http://docs.joomla.org/Vulnerable_Extensions_List

Things to do before your site gets hacked
http://magazine.joomla.org/topics/item/66-things-to-do-before-your-site-...

http://magazine.joomla.org/topics/item/378-how-offline-is-joomla-offline...