http://www.edutopia.org

http://www.bie.org

http://www.pbl-online.org

http://www.ruraledu.org/site/c.beJMIZOCIrH/b.1073935/k.EBFA/Placebased_Learning.htm

http://www.kidsconsortium.org

http://virtualschoolhouse.visionlink.org

http://coe.ksu.edu/pbl

http://pblmm.k12.ca.us

http://www.project-approach.com

http://www.webproject.org

http://jimmoulton.org/1.html#proj

http://www.4teachers.org

http://docs.google.com

http://www.writeboard.com

http://numsum.com

http://shambles.net/web2

http://sketchup.google.com

http://nicenet.org/

http://www.flatstanley.com/

http://www.truckerbuddy.org/

http://www.mainememory.net/schools_front.shtml

http://www.mlci.org

http://www.heifer.org/

http://kiva.org

http://www.lulu.com

http://www.raymondgeddes.com/about-school-stores.html

http://www.k12science.org/collabprojs.html

http://www.globe.gov

http://www2.johnstown.k12.oh.us/cornell/states.html