Parent Report.com does other age spans, but this link is geared to 3-5 year olds' activities
Education World's Early Childhood Center: references, resources, and fun
Marilee's Kidsworks and Kidspix, some neat K-2 activities
Preschool Zone, teaching ideas for early childhood and special education
DLTK's Crafts and Activities, some school related, some not
Big Idea, for fans of Veggies Larry the Cucumber and Bob the Tomato
Funschool Games, a lot of word, picture, and puzzle match up activities
Kids' Domain, activities, downloads, and lesson plans
First School Themes, activities, crafts, and lesson plans
Crayola, busy site by the crayon people, with links for children, parents, and teachers
A Kid's Heart.com, online games and activities, with a lot of good links for children in the early grades and their teachers
Perpetual Preschool: themes, teaching tips, and a teacher to teacher section
Letter Lane, an engaging alphabet-based activity page
Dolch Words, good list with a table for each grade level's words
Edupuppy, elementary materials for various subjects
Early Childhood Education/Daycare, one person's short list of the very best sites
Early Childhood Education, another view of the most important links
Beginning Reading Worksheets, alphabet and some early Math sheets for downloading
Early Childhood Education Listserv (discussion group) and some sites
Journal of Early Intervention from the Council for Exceptional Children's Division of Early Childhood (back issues online)
Words and Pictures, phonics builders and games for 5-7 year old level
TumbleBooks, books online (with sounds and motion)
Preschool Coloring Book.com, coloring pages, journal pages, and "no line" coloring sheets, arranged by themes (animals, western, sports, etc., even dental health)
Pics4learning, a site for creating flashcard-type pictures, with many ready for downloading
Learning Page.com has a lot of great worksheets and other materials, too
Educational Games, Worksheets, Word Lists, etc., for teachers and parents
Technology Resources for Early Childhood Education, some Boardmaker canned files and other software support
Boardmaker keyboard shortcuts and a few other suggestions
Tic Tac Toe Math Game, requires math flash cards and a 3x3 grid
K-3 Math from the Jacksonville School District
Cool Math for Kids, this is for elementary and middle school, but the site has links for higher math too
K-3 Language Arts from the Jacksonville School District
2-Week Unit on Body Parts with activities for students of various levels
2-Week Unit on Shapes with activities for students of various levels Aplusmath.com creates math cards and games based on the facts you need to know Comprehensive Activities Site (with some overlap of links referenced here)
Brain Pop, fun site that uses short videos for lessons in Science, Math, and English based on U.S. national standard for grades 3 through 8 in these subject area
Enrichment Activities for Gifted students, with links to the 3rd through 8th grade curriculum
Math and Reading Help for Kids is an article directory full of tips and resources for helping kids perform better at school. There is also a homework help section for all grade levels
Cyberbee, various elementary activities and curriculum ideas
Kids' Freeware, a lot of free software (games and activities) for downloading
Sentence Building Game, downloadable freeware
All 4th and 5th Grade Subjects, useful research and homework help site
Cool Math for Kids, this is for elementary and middle school, but the site has links for higher math too
The Internet as an Encyclopedia, and a great effort at that!
Reading Planet, the kids' link on the Reading is Fundamental site
Kids in the House, informative and entertaining site from the Clerk of the U.S. House of Representatives (meant for middle school-aged students)
Virtual Science Fair, with a lot of experimental designs and ideas for Science Fair projects
All Science Fair Projects, over 500 on this site, categorized and searchable
Widgets, interactive problems from Washington State University (you have to have Shockwave loaded first, or download it from their site, then reboot)
Stories to Grow By, for elementary schoolers to use (with parent and teacher links to help)
50 States, nicely done set of facts about each of the United States
SodaConstructor, students can create and then move objects or set in motion objects developed by others
Science Activities Manual for kindergarten to 8th grade National Geographic for Kids. The homepage also has links for parents and teachers
Glencoe, the textbook publisher's site for sixth through twelfth grade activities
Applied Math Activities, linked to specific occupations
SOS Mathematics, help with middle and high school math
Channel One Teacher, good current events/news activities site for intermediate and early high school students
TerrServer, from the U.S. Geological Survey; check out the advanced search to find your school or home
U.S. Central Intelligence Agency Publications, includes a great World Factbook and maps
County/City Databook, a searchable resource from Census 2000
Country Studies from the Library of Congress
Discovery Channel's school link. Also see BJ Pinchbeck's Homework Helper
PuzzleMaker, from the Discovery Channel's school link, good for crossword and wordsearch puzzle development
Ancient Civilizations, great site from a middle school teacher in Pennsylvania
Basic Human Needs Course, content from a Vermont middle school teacher's course
Aesop's Fables, nicely done collection of the famous stories with morals Study Guides.net, well done collection in all subject areas
Study Skills, suggestions for high school students from Studyguides.net
Digital Reference Library, easy to use source from the University of Pennsylvania
Bulfinch's Mythology, fables, epics, etc.
Complete Shakespeare, MIT's link to each of the plays
List of Classic Works available for Literature.org, by author
Bartleby, classic works and reference books online
A Book a Minute, highly condensed classics, science fiction, and bedtime stories. Irreverent, but it's a hoot. The site even has a movies link.
SparkNotes, better at online study aids than its more famous cousin, CliffsNotes. These sites are for students, of course. But teachers will enjoy the user's comments sprinkled throughout the SparkNotes site.
Grammar, help at the senior high, college level
Britannica, a searchable version of the encyclopedia
Periodic Table of Elements, clickable, printable, and manipulatable
Economic Overview from Economy.com
Recent U.S. Supreme Court Cases by year
U.S. Senate, happenings at the Capitol in Washington, D.C.
U.S. House of Representatives, happenings at the Capitol in Washington, D.C.
Statistical Abstract of the United States, based on the year 2000 Census returns
U.S. Government Notes on Foreign Countries, arranged geographically (by region) and alphabetically
Country Studies from the Library of Congress
U.S. Central Intelligence Agency Publications, includes a great World Factbook and maps
Federal Statistics, U.S. statistics arranged by state or region and grouped by various topics
Scientific American, the online version of the magazine
Applied Math Activities, linked to specific occupations
SOS Mathematics, help with middle and high school math
Math Links from textbook publisher Holt, Rinehart, and Winston
Math Prep for Standardized Tests, from Chicago Public Schools
ThinkQuest, a searchable database of 4,500 education-related Web sites
Schoolwork.org is for high school help
700+ Great Sites for History, Geology, Science, and Technology
Glencoe, the textbook publisher's site for sixth through twelfth grade activities
Delphi For Fun.Org's classic math topics
ExploreMath.com for Math activities and lesson plans
Hot Math.Org has odd-numbered solutions for many of the texts used in high schools
Secondary Education Vocational Programs from the State of Tennessee Department of Education, site gives the curriculum standards for many of the areas 
