PBL-Online, a one stop solution for Project Based Learning! You'll find all the resources you need to design and manage high quality projects for middle and high school students. The site promotes professional development and there is also an online course that awards credit for taking a course in project based learning. There provide access to various workbooks on PBL and links to other relevant websites.
Project Based learning for 21st century http://www.bie.org/about/ This website is sponsored by Buck Institute of Education . It main emphasis is helping educators to implement project based learning in their classroom. There are a number of videos illustrating how PBL is approached in some classrooms. The site also provides links to various researchs that support PBL.