Links I've found useful and/or entertaining, listed in no particular order.
News
Ars Technica
Network World
SANS Internet Storm Center
Viruslist.com Analyst's Diary
Cisco Reference
Certifications
Cisco Support Wiki
EOS/EOL Products
Feature Navigator
IOS 12.4 Mainline Documentation
IOS Software Selector
Network Topology Icons
Portable Product Sheets
Product Support
Solution Reference Network Designs
What's New in Product Documentation
Networking
911networks.com
Charles Spurgeon's Ethernet Site
His book is awesome
Dynamips blog
By Chris Fillot
Firewall.cx
IANA
Many protocol/number assignments are found here
IEEE OUI Assignment Search
Identify the vendor which owns a particular MAC address
Internet Health Report
Internetwork Pro Wiki
Lots of good Cisco info
Javvin
Networking Forum
NIL CT3 Wiki
A Cisco-oriented wiki started by Ivan Pepelnjak
OpenPacket.org
Organized packet capture repository
Rate My Network Diagram
It's like hotornot with Visio
Route Views Project
List of public looking glasses
The Packet University
The Prefix WhoIs Project
Neat, detailed WHOIS database
Various Cisco Documents
General Tech
Ars Technica's OpenForum
attrition.org
Cheat Sheets by Dave Child
Data Center Knowledge
League of Professional System Administrators
Open Source Alternative
A great database of open source alternatives to commercial software
SANS Reading Room
UnixWiz.net
Steve Friedl
Humor
Cectic
Ctrl+Alt+Del
Cyanide & Happiness
Dilbert
ExtraLife
Least I Could Do
LegoRobot Comics
Penny Arcade
Questionable Content
Real Life
Saturday Morning Breakfast Cereal
User Friendly
VG Cats
XKCD
Blogs
6200networks
By Joe Harris, CCIE #6200
A Networker Blog
By Victor Cappuccio
Aaron Paxson
Aaron's Worthless Words
By Aaron Conaway
Arden Packeer
Blindhog
Excellent video tutorials
Brandon Carroll
Bruce Schneier
Crypto expert
CCIE Candidate
By Ethan Banks
CCIE in 3 Months
CCIE Journey
By Carl Yost Jr.
CCIE Pilot
CCIE Pursuit
CertProject
By Carlito Cubilla
Cisco Blog
By Jeremy Cioara
Cisco Blogs
Official blogs at cisco.com
Cisco IOS Hints and Tricks
Excellent daily tips by Ivan Pepelnjak
Colin McNamara
Dancho Danchev's Blog
Great infosec news
EDF Network
Errata Security
ha.ckers.org
Web application security
Kevin Dorrell
My Etherealmind
By Greg Ferro
Richard Bannister
Route My World
Tao Security
Security blog by Richard Bejtlich
The Ferret's Corner
Linux
Gentoo Linux
My distro of choice
Interactive Linux kernel map
Linux From Scratch
Hardcore Linux
Linux Standard Base
Security
.aware
CIRT.net Default Passwords List
darkc0de.com
eEye Zero-Day Tracker
illmob
Milw0rm
Open Source Security Testing Methodology Manual
Packet Storm
Phenoelit
Phrack
ezine
THC
Uninformed
ezine
Wiretapped
Miscellaneous
Bookpool
Great outlet for tech books
Cisco Resumes
BradeReese.com
Internet Maps by Chris Harrison
Resume writing guide
Weather in Iraq
The weather where I am right now
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