Dave Johnson on open web technologies, social software and Java
On balance, XWiki wins by virtue of having better support for management, searching, page taxonomies, virtual servers, content export and language translation/localization support.
JSPWiki has slightly better support for identifying orphaned pages and accesskey support (XWiki 1.4 will have support for access keys).
Confluence was not considered because requirement #0 is "the software must be free and open source," which seems like a reasonable request when selecting software for an open source community site.
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