NFL Alumni Headquarters
Official web site of the NFL Alumni. Dues-paying membership association. Anyone who ever played professional football qualifies as a Professional Member. Other individuals may enroll as Associate or Corporate members. The primary criterion for joining the NFL Alumni is a desire to support the charitable goals and activities of the organization.
http://www.nflalumni.org/

NFL Coaches Association
Football news, interviews, chat, and event calendar.
http://www.nflcoaches.com

HowStuffWorks: "How NFL Equipment Works"
How equipment is selected and protects players.
http://people.howstuffworks.com/fb-equip.htm

National Football League Players Association (NFLPA)
Players' union responsible for collective bargaining. Offers FAQ, union history, information for NFL hopefuls, information for current and retired players, and community programs.
http://www.nflpa.org/

Wikipedia
Covers the regular season scheduling formula, playoff format, college draft, salary cap, racial policies, television contracts, video games, lore and history, and famous nicknames.
http://en.wikipedia.org/wiki/NFL

NFL Canada
League coverage with a Canadian flavor. Profiles of Canadian players in the NFL, history, local NFL events, and information on the NFL/CFL Alliance.
http://www.nflcanada.com/

NFL Team History.com
Features, franchise history and records, draft history, rules, and cheerleaders.
http://www.nflteamhistory.com

NFL Football Helmets and Animations
Offers free graphics of static and animated helmets for use on web pages.
http://nflhelmets.tvheaven.com/

The AFC East
News, analysis and statistics for all teams in the Division.
http://www.theafceast.com

RetiredPlayers.Org
Focused on disability and retirement issues for former NFL players.
http://www.retiredplayers.org

NFL Football Videos
Collected NFL videos from around the web.
http://www.nflfootballvideos.com

NFL Sport Channel
Videos from around the web on the NFL.
http://www.nflsportchannel.com