Cut-the-knot - interactive mathematical games and puzzles
http://www.cut-the-knot.org/

Education City - Education City has more than 1,000 activities mapped to state standards in Language Arts, Math, Science and ELL
http://us.educationcity.com/

Funbrain - more than 100 fun, interactive games that develop skills in math, reading, and literacy
http://www.funbrain.com/

Gamequarium - over 1500 games - test your skill! Games are grouped for Pk-2 and 3-6+. 
http://gamequarium.com/

Starfall - The Starfall reading program is designed to be fun, exciting, and to instill confidence in young children as they learn to read
http://www.starfall.com/

 Poetry by Kristine O'Connell George helps students and teachers understand poetry.  It also contains podcasts of poems in the Poetry Aloud section.
 http://www.kristinegeorge.com/

               Crickweb - free online educational resources and games
http://www.crickweb.co.uk/