More than 4 years ago we embarked on a journey to examine the Motivation of Open Source developers in a more holistic fashion, considering Open Source as a Social Practice rather than focus on the common intrinsic/extrinsic distinction.
It has been a longer journey than we had planned, but it finally paid off. This June issue of MISQ contains the final article, so it is officially out. If you are interested in Motivation research in OSS communities, read (preprint here), comment, and cite :-):
von Krogh, Georg; Haefliger, Stefan; Spaeth, Sebastian; and Wallin, Martin W.. 2012. “Carrots and Rainbows: Motivation and Social Practice in Open Source Software Development,” MIS Quarterly, (36: 2) pp.649-676