a5e64d83_ureStatus20120119____XWiki_org__Status_as_of_2012_01_19
[Feature] P2P Wiki Servers (let wikis communicate together without the need for a central server) [Status as of 2012/01/19] 
A prototype has been produced as a result of the Concerto research project. It's available for download but it was developed for an older version of XWiki (2.0) and needs more updating and polishing work to make it usable in production.
Feature Status - Jan 2012 (Blog.FeatureStatus20120119) - XWiki.org
Status as of 2012/01/19