Project Based Learning
http://www.edutopia.org/project-learning
Thematic Units
http://www.emints.org/ethemes/resources/by-title.shtml List of Thematic units with weblinks.
http://www.theteacherscorner.net/thematicunits/
http://www.teach-nology.com/themes/
http://www.teacherplanet.com/resource/atoz.php
Webquest
http://webquest.org/search/index.php
Rainforest Unit
http://ted.coe.wayne.edu/sse/units/rain.htm
http://www.lessonplanspage.com/RainForestUnitA.htm
Sample of how a school uses a Wiki with students
http://studyingsocietiesatjhk.pbwiki.com/
A unit on Linear Equations
http://mrvaudrey.com/category/actual-math/
Database of projects
PBL Community--Project Based Learning for the 21st Century
https://plus.google.com/communities/105127936409761280514