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.
http://riot.ieor.berkeley.edu/~baseball/Society for American Baseball Research (SABR)
Research information, SABR on-line bookstore, on-line membership application, bulletin board comments page, and baseball links.
http://www.sabr.org/
SABR/Bob Davids Chapter
Regional SABR chapter covering major and minor league baseball teams in the Mid-Atlantic area.
http://www.sabrdc.org/
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.
http://www.baseballprospectus.com
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.
http://highboskage.com/
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.
http://www.sabruk.org/
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.
http://mysite.verizon.net/brak2.0/
Voros' Baseball Analysis
Contains many archived sabermetric studies, including seminal work on defense-independent pitching statistics.
http://www.baseballthinkfactory.org/mccracken/
Tango On Baseball
A collection of various research about linear weights, runs, and wins.
http://www.tangotiger.net/
Red Sox Stats
Calculations for the Red Sox organization. Also statistics for all MLB players.
http://www.redsoxstats.com/
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.
http://www.baseballthinkfactory.org/btf/
SportMetrika, Inc.
The corporate website for a team of consultants to sports organizations.
http://www.sportmetrika.com/
Baseball Graphs
Gain clearer intuition about baseball by using innovative ways to visualize baseball statistics.
http://www.baseballgraphs.com/main/index.php/site/
The Hardball Times
This baseball digest gives daily doses of analytical observations from the game of baseball.
http://www.hardballtimes.com/
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.
http://baseballanalysts.com/
