Recently I attended a Project Based Learning workshop through the Buck Institute for Education. The presenters did an excellent job of walking attendees through how to create a PBL lesson for your classroom.
Their website, www.bie.org, has some excellent resources for all subject areas. There is a Project Search section designed to help teachers find PBL projects. Search results indicate what subject the project is for and what Common Core standard the project reaches.
The Tools section of the BIE website is also very helpful. It contains rubrics, project design information, group contracts for students, and articles related to Project Based Learning. There are resources available for all grade levels.
Consider following them on Twitter as well: @biepbl