K-12 Lesson Plans from the International Reading Association, which are sortable by grade level and focus.
NCATE standards for P-12 TESOL accredidation
International Children's Library offers free digital children's books in English as well as 53 other languages. Not only is it a great resource for developing literacy in English, but also can be an excellent resource teaching other languages.
LearnEnglish Kids, sponsored by the British Council, offers games, songs, stories, and much more to ELL's.
PBSKids brings the fun to learning with coloring, games, and more.
Free Phonics Resources can be found at MES English, including posters, worksheets, and more.
English4Kids brings English to life with a bounty of free resources.
Center for Applied Linguistics provides free downloadable articles for PreK-12 teachers.
Colorín Colorado is a bilingual (Spanish and English) site for families and educators of English langauge learners.