LearnZillion has literally “zillions” of Math and English Language Arts lesson plans aligned with National Common Core State Standards. Lessons include a downloadable & customizable lesson plan (Word document), supporting materials (Word or PDF format), and video instruction that students can access at school or at home. To access all materials, users will need a free account (logging in with an existing Google Account was the quickest for me). The ability to preview some of the materials (in a Scribd frame) was blocked for me, but downloading the materials instead took care of the problem.
What a great resource!