I suggest you look through the site on your own but there are some pages I would like to direct your attention too. The first is the P21 Framework Definitions. Sometimes it is difficult to understand everything that the 21st Century Skills include. This page gives a breakdown of each skill and are especially helpful. I did not realize everything the these skills encompass. Another great aspect is the video archive. This page gives snapshots of different skills and how they can be implemented into the classroom. While there are many pages I would like to direct you, the last has the largest implication for me. The 21st Century Maps are amazing. Each gives specific examples of lessons using 21st century skills. I wish I had more time in the day to sit and read each lesson!
Overall, this is a great site that you just have to search for yourself. I cannot begin to relay all the information that it contains.