The National Clearinghouse for English Language Acquisition has published a list of websites with younger ELs in mind.
Websites Offering Learning Activities for Young ELs
http://learnenglishkids.britishcouncil.org/en/: language games, songs, and stories
http://www.literacycenter.net/: activities to learn numbers, colors, shapes, reading and writing letters and words
http://www.starfall.com: reading instruction and reading games
http://www.rif.org/kids/readingplanet.htm: language-related activities and stories
http://www.storyplace.org/preschool/other.asp: stories and language-learning activities
http://pbskids.org/: a variety of reading, writing, and learning activities
http://pbskids.org/berenstainbears/games/story/index.html: learning activities to prepare children for school
http://www.storylineonline.net/: stories read by actors from the ScreenActors' Guild.
http://www.scholastic.com/clifford/: reading and writing activities
http://www.eduplace.com/kids/hmsc/content/simulation/#gk: science content from Houghton Mifflin Science Series
(Source: www.ncela.gwu.edu, Winter 2012 Issue of AccELLerate!)
Everyday ELL is now Every Language Learner.