Textbooks & Handbooks
A 500 page book by Charles M. Grinstead (Swarthmore College)and J. Laurie Snell (Dartmouth College)
http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/pdf.html
Statistical concepts by Will G Hopkinst explained for biologists, with almost no math
http://www.sportsci.org/resource/stats/index.html
Online textbook on statistics
http://davidmlane.com/hyperstat/
Free, full-length, and occasionally interactive statistics textbook by Richard Lowry
http://faculty.vassar.edu/lowry/webtext.html
By Gerard E. Dallal
http://www.jerrydallal.com/LHSP/LHSP.HTM
http://www.statsoft.com/textbook/ieglfra.html
Library to help biologists learn about data analysis. This "library" contains articles and manuals, as well as links to web sites and books.
http://www.graphpad.com/index.cfm?cmd=library.index
Interpreting Nonsignificant P values
http://www.graphpad.com/www/book/Interpret.htm
By Gerard E. Dallal, PhD
http://www.jerrydallal.com/LHSP/mc.htm
Tools
Website for Statistical Computation which brings useful and user-friendly tools for performing statistical computations
http://faculty.vassar.edu/lowry/VassarStats.html
A place to find randomization tools
http://www.randomization.com/