(1) Organizations concerned with crime and criminal justice
Bureau of Justice Statistics
http://bjs.ojp.usdoj.gov/
Campbell Collaboration
http://www.campbellcollaboration.org/
Center for Evidence-Based Crime Policy
http://gunston.gmu.edu/cebcp/
Center for Problem-Oriented Policing
http://www.popcenter.org/
International Association of Crime Analysts
http://www.iaca.net/
Home Office (U.K.) Research & Statistics
http://www.homeoffice.gov.uk/rds/index.html
National Criminal Justice Reference Service
http://www.ncjrs.gov/
(2) Professors with helpful websites
Professor Geoff Alpert, University of South Carolina
http://www.deadlyforce.com
Professor Charis Kubrin, University of California at Irvine
http://socialecology.uci.edu/faculty/ckubrin
Professor Jerry Ratcliffe, Temple University
http://jratcliffe.net
Professor Rob Sampson, Harvard University
http://www.wjh.harvard.edu/soc/faculty/sampson/
Professor Wes Skogan, Northwestern University
http://www.skogan.org
Professor Ralph Taylor, Temple University
http://www.rbtaylor.net
Professor Samuel Walker, University of Nebraska at Omaha
http://samuelwalker.net/
Professor Ron Weitzer, George Washington University
http://www.gwu.edu/~soc/faculty/weitzer.cfm
(3) Other sites
Mplus (terrific statistical modeling software)
http://www.statmodel.com