Here is a list of past winners of the MSR Mining Challenge.
General Challenge: J. Krinke, N. Gold, Y. Jia, D. Binkley
Cloning and Copying between GNOME Projects
General Challenge: E. Shihab, Z. Jiang, A.E. Hassan
On the use of Internet Relay Chat (IRC) meeting by developers of the GNOME GTK+ project
General Challenge: R. Holmes, R. Walker
A newbie's guide to Eclipse APIs
General Challenge: E. Linstead, P. Rigor, S. Bajracharya, C. Lopes, P. Baldi
Mining Eclipse Developer Contributions via Author-Topic Models
General Challenge: D. German