Starfall.com - Fun phonics games for the younger grades (Pre-K - 2)
Mrs. P's - Storytelling
kindersite.org - Thousands of graded educational songs, games, and stories
coolmath-games.com/ - Strategy, skill, numbers, logic, and more
poetry4kids.com - Poetry site by Kenn Nesbitt / Check this out for haiku competition help
pbskids.org - Educational games and videos with characters from favorite PBS shows
abcya.com - Educational games for grades 1 - 6 (Numbers, reading, math, typing, and more)
funbrain.com - Math and reading, online games, books, comics, and more fun
storyonline.net - Thank You, Mr. Falker, I Need My Monster, Guji Guji, and lots more great stories
vocabtest.com - Make your own vocabulary tests and games, or take those created by others
Common Core Online Activities - Specific to grade level and target skill
Sarah4.yolasite.com - Student-Made website with links to games and recipes:
http://www.studystack.com/wordscramble-270676 - Library Word Scramble
http://www.bibliomania.com/bibliomania-static/index.html - Online literature and study guides (Older / Advanced)