This Education Week opinion piece is from a high school math teacher in Kentucky, where the entire state has pulled together to implement the CCSS in a comprehensive, unified manner.
Sarah Brown Wessling is the Teaching Channel's Teacher of the Year spokeswoman, and this page has a handful of links near the bottom that allow you to view great explanatory videos related to the Common Core standards.
This is the NJ ASK information booklet that is sent home with students. It is produced by the NJ Department of Education, and it has information about the NJ ASK as well as sample items.
NYC's DOE put together a comprehensive and searchable set of sample problems that teachers can use to step-up the rigor in math class. This page allows you to use keywords, grade level and subject to filter results.
Scholastic has quality resources, and this overview of the Common Core's mathematical practices is an excellent source of information and links. If you want to ensure your expectations are high enough to prepare students for PARCC testing, this page is a useful start.