Pathfinder Schoolhouse
http://www.teacherpathfinder.org/School/school.html

K-3 Map Adventures (provided by the USGS, teachers and students learn on-line to read and visualize maps)
http://education.usgs.gov/

Turtle Lessons (K-3 integrated language, math and science skills)
http://www.ed.uri.edu/unitweb/Paull/TurtleTales.htm

ASKEric Lesson Plans (listed by topic area)
http://ericir.syr.edu/Virtual/Lessons/

American Memory Lesson Plans (from the Library of Congress-National Digital Library...lesson plans by grade level and discipline area)
http://memory.loc.gov/ammem/ndlpedu/lessons/index.html

QUEST: NASAs K-12 Internet Initiative (look in Classes you can teach using the internet)
http://quest.arc.nasa.gov/

NCDPI Lesson Plans (This site is developing and contains a a growing list of on-line plans associated with the North Carolina Standard Course of Study)
http://www.ncpublicschools.org/schoolimprovement/support/resources/forteachers/units

LEARN-NC (site has a wealth of on-line resources for PK-12 teachers)
http://www.learnnc.org/

Math and Sciences Lesson Plans
http://scssi.scetv.org/mims/lessplns.htm

Blue Web'n (a comprehensive collection of lesson plans listed by discipline)
http://www.kn.pacbell.com/wired/bluewebn/index.html#table