General Sports Information Sources:

ESPN SportsZone Basic information for free; a paid subscription
gets you feature articles and more
Fox Sports Fox's cyber scoreboard
The Sporting News-Baseball Baseball and other sports from the authority

Information Sources for Specific Sports:

Major League Baseball
The NFL
The NBA
CBS College Basketball
The NHL
Europe / World Soccer
GolfWeb
NBC Sports - Golf Tour
Golf Magazine's Golf Online
Ladies' Professional Golf Association

USFA United States Fencing Association
Snoweb's Skiing Page
TennisServer
Anglers Online
RecWorld
Fisherman's Factory Outlet
Big Fish Fishing Tackle Online
OutdoorWorld
Woods and Water Hunting
Snowboarding Page