Some online sites for background reading on Project Based Learning. 

PROJECT BASED LEARNING - GENERAL 

Project based learning with Multimedia: The Challenge 2000 Multimedia Project: San Mateo County Office of Education
http://pblmm.k12.ca.us/ 

The Project approach in early childhood and elementary education
http://www.project-approach.com/
(This is really super for Primary Schools – practical, real-life questions and examples for teachers!) 

Criteria for Authentic Project-Based Learning  Nancy Kraft  RMC Research CorporationDenver, Colorado
http://www.rmcdenver.com/useguide/pbl.htm

Project Based Learning   @  2 Learn Together
http://www.2learn.ca/projects/together/KWORDS/projecta.html

Project based learning – What is it?
http://www.4teachers.org/projectbased/

Houghton Mifflin’s Project Based learning Space
http://college.hmco.com/education/pbl/index.html

Project, Problem, and Inquiry-based Learning
http://www.eduscapes.com/tap/topic43.htm

Mergendoller, John R, Thomas, John W  Managing Project Based Learning Principles from the Field