Sponsored by the George Lucas Education Foundation, this is a great resource for research as well as case studies of best practices. They have a feature section on Project Based Learning.
A great source for inquiry based instruction and other teaching techniques, ideas, and conversation around creative instruction to improve student learning.
This is a good site for following through on ideas related to project-based learning. The CFT is working to bring the Buck Institute to Atlanta in July 2012 for a 3-day workshop at Drew Charter School.
Look at this article on Edutopia's website that we written by Linda Darling Hammond and Brigid Barron on the merits of PBL. Really good piece that is quoted by many other people writing in this field.
Kenneth Olden teaches ninth and twelfth grade English in White Swan, Washington. His interests include project-based learning and classical literature. He is participating in the pilot program for the Teaching 2.0 Master's program through the University of Wisconsin, Oshkosh. Follow Ken on Twitter @kennetholden.
This relatively new site from Discovery has some great resources for integrating STEM into the curriculum. It also gives students a look into future career paths.
In addition to providing a search engine of lesson plans and interactives from about a dozen great content partners, there some great professional development resources.
This site, created by the Department of Educational Technology in Palm Beach County is an amazing resource if you have any thoughts about integrating iPads.