CNET Internet Services http://www.cnet.com/internet/0-3761.html ** Need to update link **
Speed Guide http://www.speedguide.net/
DSLreports http://www.dslreports.com
Navas Cable Modem/DSL Tuning Guide http://cable-dsl.home.att.net
Blackcode http://www.blackcode.com
Antionline.com http://www.antionline.com
Gibson Research Corporation http://grc.com
ZoneAlarm PC Firewall http://www.zonelabs.com
Network Security and Remote Management Software for Windows http://www.ntutility.com/
Extreme Tech http://www.extremetech.com
The Navas Group http://navasgrp.home.att.net/
Small Net Builder http://www.timhiggins.com
The SANS Institute SysAdmin, Audit, Network, Security http://www.sans.org
hackerwhacker http://www.hackerwhacker.com/
samspade http://www.samspade.org/
PortDetective.Com - Port Detective tells you whats Open, In Use or Blocked
SORBS (Spam and Open-Relay Blocking System)