Még nem volt időm végignézni, de hátha érdekes:
http://www.youtube.com/watch?v=-6eHyShpws8
Google Tech Talk (more info below)
August 25, 2011

Presented by

Erik Moeller, VP of Engineering & Product
Rob Lanphier, Director of Platform Engineering
Alolita Sharma, Director of Features Engineering

ABSTRACT

Wikipedia is the most comprehensive encyclopedia ever created, a result of the collaboration of hundreds of thousands of people. It's operated by the Wikimedia Foundation, a non-profit. 

Learn more about some of the latest developments in wiki technology: a new editing interface for Wikipedia; social features that support collaboration; a new labs and application development infrastructure for volunteers; improved media support; developments in structured data, and more. 

Wikimedia's tech projects are 100% open source, and we're hoping Google and Wikimedia can learn from each other.