The school librarian ia a key player!
Suzie Boss blogs about the need to include the Teacher-Librarian in project-based learning teams:
"Visit schools where project-based learning (PBL) is taking hold and you are almost certain to see teachers collaborating. .... A key player to invite into these collaborative conversations is the school librarian or library media specialist. Their understanding of information literacy and digital citizenship can make a difference across the arc of projects. What's more, librarians may know about students' out-of-class interests through their reading choices or online interests. Take advantage of their insights to plan more engaging projects.
More PBL posts here: http://www.edutopia.org/blogs/beat/project-based-learning