The Department of Education just unveiled a revamped “What Works” website highlighting the results of their varied research. It seems to have a number of accessible tools. You can read more about it at Education Week.
They seem to have surprisingly little on English Language Learners, but I’m still going to add it to The Best Ways To Keep-Up With Current ELL/ESL/EFL News & Research. One would think it would eventually have something useful related to ELL’s on the site.