Technical Resources

ARIN
The American Registry of Internet Numbers is the place to find who is responsible for specific IP addresses.
http://www.arin.net

Country Codes and Top Level Domains
ISO 3166 defines country codes for every country in the world. These are also used for Top Level Domain Names such as .us for United States, etc.
http://www.appliedbc.com/countrycodes.htm

DistroWatch
Info and links to all major Linux distributions and the freely available ISO images.
http://www.distrowatch.com

DNStuff
This site has everything you need for DNS information
http://www.dnsstuff.com

IANA
The Internet Assigned Numbers Authority is responsible for assignment of IP addresses

InterNIC
This site contains domain name registry information for all domains in .com, .net,. org and other new top level domains

Lava Computer MFG, Inc.
An excellent resource for I/O hardware and info
http://www.lavalink.com

Linux Documentation Project
The definitive resource for Linux documentation.
http://www.linuxdoc.org

Linux Forums
A place to ask and answer Linux questions.
http://linuxforums.org

Linux Questions
A free forum when Linux newbies can ask questions and Linux experts can offer advice.
http://www.linuxquestions.org

Linux Tutorials
Linux Installation and Getting Started - An introduction to the Linux operating system. How and where to get Linux, installation, a beginning Unix tutorial, and an introduction to system administration. This is the first book anyone with a hands-on interest in Linux should read.

O'Reilly Open Books Project
Free computer books in an online format. This company also publishes what I think are the best books overall in the computer industry and worth the price paid for the technical user, system administrator and programmer.
http://www.oreilly.com/openbook

SourceForge
The central site for all open source projects.
http://www.sourceforge.net

Wikipedia
The free open-source encyclopedia in many languages. An excellent site and example of an open-source application.
http://en.wikipedia.org