DOE - Linking High School Math and Science with Statistical Design of Experiments (DOE)
http://www.misd.net/Mathematics/hsmathscience.htm

Elementary Statistics Textbook from StatSoft
http://www.statsoft.com/textbook/esc1.html

Manufacturing Statistics
http://reliability.sandia.gov/Manuf_Statistics/Statistical_Modeling/statistical_modeling.html

NIST/SEMATECH e-Handbook of Statistical Methods
http://www.itl.nist.gov/div898/handbook/

Online Statistics: A Multimedia Course of Study
http://psych.rice.edu/online_stat/

Rice Virtual Lab in Statistics
http://www.ruf.rice.edu/%7Elane/rvls.html

Seeing Statistics
http://www.seeingstatistics.com/

Statistical Analysis Tools (David Lane)
http://davidmlane.com/hyperstat/Statistical_analyses.html

Statistical Software Tools
http://www.stats.gla.ac.uk/cti/links_stats/software.html

Statistical Training On the Web
http://www.bioss.sari.ac.uk/~mike/webtra.htm

Statistics Internet Library
http://www.businessbookmall.com/free-stuff-statistics.htm

Statistics On The Web - Clay Helberg
http://home.execpc.com/~helberg/statistics.html

SkyMark References
http://www.skymark.com/resources/refhome.asp

Tom Jenkins's Statistical Simulation Exercise
http://ssrn.com/abstract=1422333

Virtual Reference Desk
http://www.lib.purdue.edu/math/