Doug's Business of Baseball Weblog
http://roadsidephotos.sabr.org/baseball/bbblog.htm
Doug Pappas's Business of Baseball Pages
http://roadsidephotos.sabr.org/baseball/index.htm
The Society for American Baseball Research
http://www.sabr.org
The Hardball Times
http://www.hardballtimes.com
Baseball Prospectus
http://baseballprospectus.com
The Baseball Analysts
http://baseballanalysts.com
Baseball Think Factory
http://www.baseballthinkfactory.org/files/main/lowres
Sabermetric Baseball Encyclopedia
http://www.baseball-encyclopedia.com
Fangraphs
http://www.fangraphs.com/index.aspx
Baseball Graphs
http://www.baseballgraphs.com/main/index.php/site
Statistically Speaking
http://stats.mostvaluablenetwork.com
Baseball Graphs
http://www.baseballgraphs.com/main/index.php/site
Many Go; Few Understand
http://journals.aol.com/bads85/ManyGoFewUnderstand
Sabermetric Research
http://sabermetricresearch.blogspot.com
The Sports Economist
http://www.thesportseconomist.com
Walk Like a Sabermetrician
http://walksaber.blogspot.com
Dan Agonistes
http://danagonistes.blogspot.com
BaseballRace
http://www.baseballrace.com/default.asp
Beyond the Boxscore Feeds
http://www.beyondtheboxscore.com
Futility Infielder
http://www.futilityinfielder.com/home.php
Elias Sports Bureau
http://www.esb.com