Partnership for 21st Century Skills - This organization is striving to combine the 3 R's with the 4 C's (critical thinking, communication, collaboration, creativity). P21 not only focuses on working with educators, but also with the community, through parents, state initiatives, and anyone that is interested in helping students have the skills needed for the 21st century.
Edutopia Problem Based Learning - This page on Edutopia provides a number of videos that discusses project based learning. Many the projects are large, but it gives a teacher a good overview and can hopefully inspire new projects.