Church of IP
   Includes FAQs, tips, discussion board, tools, and recommended books.
   http://www.churchofip.org/

Connected - The IP Protocol
   Section 3 of "Connected: An Internet Encyclopedia" discusses datagrams and streams, subnetting, and the delivery model.
   http://www.freesoft.org/CIE/Course/Section3/

Foundations of the Internet Protocol
   ACM Crossroads magazine article explains network protocol concepts, IP packets, and IP addressing.
   http://www.acm.org/crossroads/columns/connector/july2000.html

IP Performance Metrics Charter
   IP Performance Metrics (IPPM) Working Group at IETF.
   http://www.ietf.org/html.charters/ippm-charter.html

IP Self Test
   This 18-question online quiz tests your knowledge of the nuts and bolts of Internet Protocol.
   http://compnetworking.about.com/od/networkprotocolsip/l/aa081000a.htm

IPMI - IP Multicast Initiative
   Forum to accelerate adoption of the IP Multicast Initiative through education and marketing.
   http://www.ipmulticast.com

IPTV News.net
   Offers information and news on the evolving technologies of internet protocol television including hardware, software, and services.
   http://www.iptvnews.net/

Museum of Broken Packets
   Collection of broken, malformed, or peculiar packets found on the Internet, with theories as to how they came to be.
   http://lcamtuf.coredump.cx/mobp/

MyWanIP
   Free utility detects one's current IP address from behind a router.
   http://www.mywanip.com/

RFC 791 - Internet Protocol
   Request For Comments 791 documents the fundamental workings of IP.
   http://tools.ietf.org/html/rfc791

TDMoIP - TDM over IP
   Application of Time Division Multiplexing technology in transporting voice and data over high-performance IP networks.
   http://www.tdmoip.com/

What Is My IP Address?
   Free service automatically determines one's address on the Internet.
   http://www.whatismyipaddress.com/

ipSwitchboard
   Site tracks the IP address of computers on the Internet, particularly Web and FTP servers.
   http://www.ipswitchboard.com/