"I use a technique I learned from Kelly Young of Pebble Creek Labs, who has designed the extraordinary curriculum we use in our mainstream classes.
It's called a Word Splash."
The Center for Research on Education, Diversity & Excellence (CREDE) is focused on improving the education of students whose ability to reach their potential is challenged by language or cultural barriers, race, geographic location, or poverty. CREDE promotes research by university faculty and graduate students and provides educators with a range of tools to help them implement best practices in the classroom.
Good stuff in their Teaching and Learning folder. Also search Common Core State Standards Collaborative INitiative for a lot of good grade level and subject area resources
"ewordify.com is powerful, free, online reading comprehension and vocabulary development software. It helps people understand difficult English faster, helps them learn words in new ways, and helps teachers create high-interest learning materials from any English text passage.
See the yellow box at the top of the page? Just paste in a difficult English sentence, paragraph, or more, or enter a web page URL and click the button. You'll instantly see an easier version, for fast understanding now. No dictionary needed! Plus, the easier version is specially highlighted to help build vocabulary."