http://www.iditarod.com/index.shtml
http://www.cabelasiditarod.com/
http://www.randomhouse.com/features/garypaulsen/

A good definistion:
http://hagar.up.ac.za/catts/learner/lindavr/lindapg1.htm
Theory behind contructivism:
http://www.stemnet.nf.ca/~elmurphy/emurphy/cle.html
More links:
http://www.musenet.org/~bkort/constructivism.html
SEDL intro page.  All about constructivism:
http://www.sedl.org/scimath/compass/v01n03/welcome.html

Social Studies
http://www.ncss.org/standards/stitle.html
History
http://www.sscnet.ucla.edu/nchs/standards.html
Geography (sort of)
http://www.nationalgeographic.com/education/standards.html
Civics/Government
http://www.civiced.org/stds.html
Economics
http://www.economicsamerica.org/standards/index.html
Psychology – High School, but is my area anyway.
http://www.apa.org/ed/natlstandards.html
Anthropology
This is a general site listing other sites.  Maybe slightly redundant, but could be useful.
http://www.education-world.com/standards/national/soc_sci/index.shtml

This really, really, cool index of everything!!!
http://www.indiana.edu/~ssdc/stand.htm

Massachusetts
http://www.doe.mass.edu/frameworks/current.html