These are some videos on using PBL.
http://www.youtube.com/biepbl Overview of what PBL is from the Bucks Institute.
http://www.edutopia.org/collaboration-age-technology-blood-bank-video High School interdisciplinary unit on blood bank.

This is an interdisciplinary 5th grade unit on designing solutions to problems astronauts face. http://www.edutopia.org/space-day

This is a unit for 5 year olds. http://www.edutopia.org/beginning-journey-five-year-olds-drive-their-own-pbl-projects

http://www.themathplace.org/shoulders/shoulders.htm great math resources for secondary math.
http://mathworld.wolfram.com/ This website has some good math resources.

I just came across this great webiste of a PBL video collection of topic and grade level specific resourses. Take a look and share what you think. http://www.pbl-online.org/video/video2.htm

Here are a few more sites to add your collection of PBL Best Practices:
http://www.youtube.com/biepbl#p/c/81BC3780C6D5D1CA/6/cJ5Z53JAivE HS Save the Beaches project - Science and Humanitities
http://www.youtube.com/biepbl#p/c/81BC3780C6D5D1CA/3/4HERh6ZNz5c Give Me Shelter HS English and SS
http://www.youtube.com/biepbl#p/c/81BC3780C6D5D1CA/0/lDMpG1Gr-QM Blood Bank Project, HS English, Art, Science
http://www.youtube.com/biepbl#p/c/81BC3780C6D5D1CA/2/OPVXg8fmtdM Middle school students at the Greater Brunswick Charter School in New Jersey complete an interdisciplinary project about gender roles combining Language Arts, History, Biology, and Media Literacy.
Classroom 2.0: http://www.classroom20.com/group/pblbetterwithpractice
Free Project Based Learning Resources That Will Place Students at The Center Of Learning:
http://21centuryedtech.wordpress.com/2010/01/16/free-project-based-learning-resources-that-will-place-students-at-the-center-of-learning/
How do I reserve my world video: http://www.youtube.com/watch?v=GQpKBNeH0eM
International PBL Academy: http://www.bie.org/professional_development/2010_international_pbl_academy_schedule/
Into to PBL from Global School Net: http://www.globalschoolnet.org/web/pbl/index.htm
MS Microsoft Live@edu http://www.microsoft.com/education/solutions/liveedu.aspx
PBL Online: http://pbl-online.org/
Project Learning from Edutopia: http://67.208.42.96:8080/project-learning
PBL Checklists: http://pblchecklist.4teachers.org/
Picture the Possibilities video: http://www.youtube.com/watch?v=EFt6qW0Pb4c
Project, problem and Inquiry based Learning: http://eduscapes.com/tap/topic43.htm
The Project Approach: http://www.projectapproach.org/
Some of these resources were shared by Naomi Harm.

http://www.youtube.com/watch?v=GQpKBNeH0eM this is a 4/5 gr project that integrates art, museum, science and writing.