Sabermetrics

Baseball Prospectus Online   - In-depth columns, prospect interviews, transaction analysis, and player cards containing Baseball Prospectus's Davenport Translations. Metrics for evaluating hitters, starters, and relievers updated daily; four to ten columns presented free of charge on the site per week.

Voros' Baseball Analysis   - Contains many archived sabermetric studies, including seminal work on defense-independent pitching statistics.

The Baseball Think Factory - The baseball braintrust gets together to create this site. Player comparisons, and statistical information kept current. Articles from the baseball minds are thorough and informative.

The Baseball Analysts - Rich Lederer and Bryan Smith contribute daily to this part-weblog, part-science project, keeping you up to date with the days statistics of interest.

Baseball Graphs - Gain clearer intuition about baseball by using innovative ways to visualize baseball statistics.

The Hardball Times - This baseball digest gives daily doses of analytical observations from the game of baseball.

High Boskage House Baseball Analysis Web Site - Statistics are updated daily. Comparisons by position, league, and historical data. Articles on theory and physics can also be found here.

Original Baseball Research - Personal site of Clifford Blau, who has made his sabermetric studies on such topics as Bill Mazeroski's fielding, the effects of artificial turf, and park factors available.

Red Sox Stats - Calculations for the Red Sox organization. Also statistics for all MLB players.

RIOT -- Major League Baseball Playoff Races - UC-Berkeley's Industrial Engineering and Operations Research department has created their own daily calculation metric for analyzing team record performance based on historical data. Results include the number of wins needed to date to guarantee a first-place division finish or playoff run, as well as to avoid elimination from first or the playoffs. Calculations provided thanks to the research of Professor Dorit S. Hochbaum.

SABR/Bob Davids Chapter - Regional SABR chapter covering major and minor league baseball teams in the Mid-Atlantic area.

Society for American Baseball Research (SABR) - Research information, SABR on-line bookstore, on-line membership application, bulletin board comments page, and baseball links.

Society for American Baseball Research (SABR) UK - An archive of research articles and illustrations and information on how to join the UK chapter of SABR.

SportMetrika, Inc. - The corporate website for a team of consultants to sports organizations.

Tango On Baseball - A collection of various research about linear weights, runs, and wins.