Re: What version of TikiWiki is this site ( tikiwiki.org) ?
The Tiki version is reported as 2.2 svn, which means the 2.2 release plus updates to the branch 2.2 files. But there have been only a few updates, and these are relatively minor I think. (The major changes will be appearing in TikiWiki 3, scheduled for release in March.)
-- Gary