Paula Cassin, thanks for your note!
I agree that BIE and High Tech High are both amazing PBL resources. At CrowdSchool, we seek to build on their great models and training resources to build a tech platform that takes the hard work out of creating and teaching PBL.
After all, no one ever trained a teacher how to use Facebook. Our unreasonable goal is to use edtech to make PBL more intuitive and easy, even for those with little or no training.