Pennsylvania Common Core Resources
Turn On Common Core Math Map - This site has a lot of information and lesson ideas for the CC standards. Very convenient design.
Inside Mathematics - This site has a collection of videos for how to implement the Common Core mathematical practices. It is sorted by practices and grades.
Illustrative Mathematics - Provides lessons and ideas for the Common Core standards.
New York Common Core Aligned Sample Questions
Rubric for Implementing the Mathematical Practices - by Park City Mathematics
California's Learning Module for the Mathematical Practices
50 Common Core Resources for Teachers
Schmoop