Pblproject.com—A site that has multiple problem based learning lessons/units available. Teachers/Schools can purchase licenses and have access to the lessons. If you want to check it out, you can get a temporary password by email Ben Bache, firstname.lastname@example.org.
If you’d like to be on the list for the weekly emails of “Weekly Warm-Ups” which are “reviews of current events or issues from a broader perspective” and that are independent lessons or lessons, email Ben Bache email@example.com. He will add you to the email list.
Check out the archive of PBL Weekly Warmups-http://pblproject.com/page.aspx?pageid=Weekly-Warmups_archive.