I haven't had a chance to go through all of this, but what I have looked at is very relevant. Especially the "downsides of OS" and what OS is not.
1. What prompted involvement in open source
a. How did it start, what kind of projects - components of larger project, documentation, seeking assistance, learning
2. How important were elements of open source
a. Collaboration
b. Access to community
c. Access to past exchanges
d. Artifacts - source code, documentation
3. Impact on professional/knowledge development
a. Education/knowledge level at start
b. Did it prompt further formal study
c. Networking (with other developers)
4. Validation
a. Certification
b. Recognition of qualifications
c. "Guru" status
Open Source Software: A Conceptual Framework for Collaborative Artifact and Knowledge Construction, Eric Scharff dissertation
Constructivism and emerging online learning pedagogy: a discussion for formal to acknowledge and promote the informal, Shalni Gulati
Open source development: the case of Linux , John Seeley-Brown
Open Source Everywhere, Wired
Open Source and Academia, Laurie Taylor and Brendan Riley
Open Space Organizations, Michael Herman
Moodle--An Open Source Development Tool for Educators (including 60 languages)Martin Dougiamas
Educator Blogs Could Boost Respect for TeachersNora Carr