Microsoft's Experimentation Platform team, which includes developers in Dublin, recently published a paper in Data Mining and Knowledge Discovery. 

The paper, titled "Controlled experiments on the web:survey and practical guide", discusses how Microsoft uses controlled experiments to allow end users to guide the development of features.

Summary: http://exp-platform.com/hippo_long.aspx

Full text (PDF): http://www.springerlink.com/content/r28m75k77u145115/fulltext.pdf