Excellent "State of the Union" paper on current trends in attacks on the Internet at large. Probably a must read for anyone in the security community. Also, very valuable, when performing a business and cost/benefit analysis for implementing certain security measures within your organization.

CERT - Overview of Attack Trends White Paper

Another good security article by Bruce Schneier. I've got some issues with Bruce, but generally his thinking is very good solid security methodologies and makes a lot of sense.

Counterpane: Crypto-Gram: May 15, 2001

Good read on computer security and following discussion.

freshmeat.net: Editorials - Preventive Security

Well, this is certainly a useful page. Especially for anyone concerned with their privacy on the Internet.

EPIC - Tools for Protecting Online Privacy

AtStake Tools. Some of these are pretty core.

@stake Research Labs - Tools

I need to read this at some point ...

The EROS Operating System

Wow. Good article on security in application development. Another great example of why I would like to link to two different topics as well. This really fits under like 3 or 4 topics....

Slashdot | The Myth of Open Source Security Revisited v2.0

Useful!

HTTP/Web Server Attack Signatures

Fixing IDS S/N. Just for my reference.

SecurityFocus

Doing computer security? You need this list. List of top 50 "security" tools in use by NMAP users.

Quality Security Tools