Test Your Password:
http://www.securitystats.com/tools/password.asp
Test Your Browser Defenses:
http://bcheck.scanit.be/bcheck/
Test Your Browser for Scumware:
http://www.doxdesk.com/parasite/
Test a Suspicious File:
uploaded files are run through a set of virus scanners
http://virusscan.jotti.org
Test Your Popup Stopper:
http://www.popuptest.com
Test Your E-mail Security:
sites send a series of (safe) e-mail messages that test for specific vulnerabilities (your virus scanner should give a warning)
http://www.gfi.com/emailsecuritytest/
http://www.jasons-toolbox.com/TestEmail
Test Your In-house Software for Security Flaws:
http://www.fortifysoftware.com/company.htm
http://www.sanctuminc.com/
Online Virus Scan with Removal (for browsers that support Java): http://fr.trendmicro-europe.com/consumer/products/housecall_launch.php

Internet Security Advice for Experienced Users:
http://surfthenetsafely.com
Downloadable Cryptography FAQ
Protecting Your Laptop: A User's Guide to Viruses and Other Malicious Programs
http://www.laptop-lcd-screen.co.uk/laptopparts/protectingyourlaptopcomputer.asp
Security Resource for End Users:
http://www.cert.org/homeusers/HomeComputerSecurity/
Tips, Papers, Pointers:
http://www.icsa.net/
User Survey of Top Security Tools:
http://www.insecure.org/
Independent Security Vulnerability Database:
http://www.osvdb.org/
Spam Blocking Tips:
http://www.cauce.org/
Spam Primer:
http://www.SpamPrimer.com
Near Field Communications Security
http://www.nearfieldcommunication.org/nfc-security-risks.html
(link suggested by Ashley from Ms. Elizabeth Massingill's class)

NIST Special Publication 800-50, Building An Information Technology Security Awareness and Training Program, (Final Version) provides guidance for building an effective information technology (IT) security program and supports requirements specified in the Federal Information Security Management Act (FISMA) of 2002 and the Office of Management and Budget (OMB) Circular A-130, Appendix III.

Failure to give attention to the area of security training puts an enterprise at great risk because security of agency resources is as much a human issue as it is a technology issue. — NIST SP 800-50.

PenTest Magazine
http://pentestmag.com

Malware Prevention and Removal:
http://www.malwarehelp.org/
Spyware Removal Guide for Experienced Users:
http://www.michaelhorowitz.com/removespyware.html
Stubborn Spyware Removal:
http://www.stopzilla.com/
Spyware Removal Utilities That Are Actually Spyware:
http://www.spywarewarrior.com/rogue_anti-spyware.htm
Clean and Spyware-Infected P2P Clients:
http://www.spywareinfo.com/articles/p2p/

Miscellaneous Security Humor

Funny FedEx Adversisement on YouTube that shows an unintended consequence of recycling and the risk to sensitive information (http://www.youtube.com/watch?v=zo5eXKGODIo)