The ever growing XWiki documentation already explains how to write very simple plugins: http://www.xwiki.org/xwiki/bin/view/DevGuide/CreatingPlugins However, for creating more useful plugins, non-documented extension points scattered all over the place have to be used. Fortunately XWiki 2.0 plans to improve this a lot, but until then this non-exhaustive collection of tips and tricks could come handy to novice plugin writers: http://hritcu.wordpress.com/2007/03/13/xwiki-plugins-tips-and-tricks/ Regards, Catalin