"SecurityDocs is the largest repository of information security resources anywhere on the web."
This is a great site as it allows you to search for security papers based on many different criteria such as category, description, rating, author etc. The site is free and doesn't require registration - Brian would approve..:-). There are lots of different categories such as Application security, encryption, firewalls, hacking, IDSW, law, security policies, tools, wireless security and so on.
As I said I only found out about this site tonight so I have not had time to browse far yet... But I will. SecurityDocs looks like a fine resource for anyone interested in securing their servers, applications, network and data.