Buck Institute for Education

This is the home website for the Buck Institute for Education, which is a nonprofit corporation dedicated to project-based learning.
Edutopia

This site is provided by the George Lucas Educational Foundation and offers several short videos.
Internet4classrooms

This site provides a compendium of other links that can support PBL. Examples include a site of biographies of famous persons in a variety of areas (science, history, politics), as well as sites providing statistics of various countries.
Resources for Idaho Teachers

This site provides resources for Differentiated Instruction, CCSS aligned Curriculum Ladders, Lesson Planning pages, Instructional Strategies, and Lesson Ideas.