The latest issue (December 2011) of the monthly Wikimedia Research Newsletter is out:

In this issue:

1 Mental health information on Wikipedia more accurate than Britannica and Kaplan & Sadock psychiatry textbook
2 Psychologists gauge impact of Wikipedia's Rorschach test coverage
3 Spell-checking the English Wikipedia
4 Wikipedians are "smart but fun", and have expertise in topics they edit
5 Wikipedia as a database for structured biological data
6 Individual and social drivers of participation in Wikipedia
7 Mining article revision histories for insights into open collaboration
8 Briefly
9 References

15 items were covered in this issue

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Dario Taraborelli, PhD
Senior Research Analyst
Wikimedia Foundation