Lesson Planning sites
The most important thing about starting to teach to the Common Core Standards is to start! These sites have lessons that can start you on the path.
This site requires some drill down to find the questions / promised illustrations, but it is worth the effort.
This site allows you to search by CCSS strand or by content and grade level, your choice. It has a good variety and selection from which to choose.
Inside mathematics has something other sites do not, and that is VIDEOS of teachers teaching the materials successfully. Even if I never use the lessons, the videos are great to see the shifts and how to improve my teaching.
Is a one stop shop. They have PD, templates, lessons, and anything else that would help a teacher step up to the CCSS.
Has a forum and other materials to support teachers creating materials for CCSSM lessons. There is a lot of material here, but you have to search for it to find it.