This is an abstract of an article that might help explore methods certain technologies use to effect learning. In this case it is about webcasting and Podcasting.
A pdf of "latest developments" in educational technology on student achievement.
Use of multimedia on autistic students, and the effects on acheivement
This gives some definitions for project-based learning
"The overall purpose of [the study] is to integrate the use of technology as a tool into curriculum and instruction to prepare students to meet state academic standards."
"This report summarizes the 2005-2006 evaluation results of the Michigan Freedom to Learn (FTL) program. The major goal of the FTL program is to improve student learning and achievement in Michigan schools through the integration of 21st Century technology tools with teaching and learning in
K-12 classrooms. A key component of FTL was a rigorous and comprehensive evaluation study designed to gauge the impacts of the program relative to its primary goals."
This was a white paper explaining why Mac OS was picked for educational purposes in certain school districts.
Has an account of the Buddy Project "explicitly aimed for the computers to be used for school-related academic tasks as well as personal tasks." Also sites the LAB Project, from (I think) the North central Regional Educational Laboratory. While this article isn't useful as a study itself, it refers to a few. Check out the review of literature.
The provides a substantial definition of Problem Based Learning, as well as its origins on page 140-141