In a recent survey of US scholars of International Relations and related fields by the Institute for the Theory and Practice of International Relations at the College of William and Mary (http://irtheoryandpractice.wm.edu/), for the question that asked "Which of the following have you cited in your scholarship and/or used as a teaching/grading tool?" 13.46% said they used "Wiki, such as Wikipedia" in scholarship, and 52.36% said they used it for Teaching.
In addition, 14.6% of respondents said "I allow students to cite Wikipedia entries in research papers." and 6.96% said "I have edited a Wikipedia entry related to my area of expertise.
The survey was made available in September and can be downloaded here: http://irtheoryandpractice.wm.edu/projects/trip/
Sincerely,
Nicholas Michael Bashour Vice President Wikimedia, District of Columbia Washington, DC, USA
IRTA Fellow Cellular and Developmental Neurobiology Section National Institute of Neurological Disorders and Stroke National Institutes of Health Bethesda, MD, USA