Linux Distros
Sift Toolkit (Forensics)
http://computer-forensics.sans.org/community/downloads
Kali Linux (Incident Handling/Pen-testing/Forensics) http://www.kali.org/
Security Onion (Intrusion Analysis)
http://code.google.com/p/security-onion/wiki/Installation
SANS blogs
http://pen-testing.sans.org/
http://it-audit.sans.org/
http://computer-forensics.sans.org/
Links
http://blog.commandlinekungfu.com/
http://www.pauldotcom.com/
http://www.counterhack.net/
http://www.ethicalhacker.net/
http://www.devcheatsheet.com/
http://www.deer-run.com
http://www.cisecurity.org
http://www.mandiant.com/
http://www.irongeek.com
http://www.offensive-security.com/metasploit-unleashed/
https://www.fedvte-fsi.gov/VTE.LMS.WEB/login
http://www.willhackforsushi.com/
http://www.coresecurity.com/
http://www.rapid7.com/Training Resources
http://www.nist.gov/index.html
http://www.skullsecurity.org/blog/
http://www.securitytube.net/
http://www.securingthehuman.org/
http://insecure.org/
http://www.coresecurity.com
http://www.owasp.org
http://exploit-db.com