This release is available both as the full package and as incremental updates to TikiWiki 2.0 or 2.1. The incremental packages require one of those versions to already be installed, and include only the files modified by the release.
Get TikiWiki 2.2 here:
https://sourceforge.net/project/showfiles.php?group_id=64258&package_id=266122
More information on 2.0
http://doc.tikiwiki.org/TikiWiki+2.0
http://info.tikiwiki.org/art35
More information on 2.1
http://info.tikiwiki.org/art40
As always, please report any security issues to security.tikiwiki.org
Work is ongoing on TikiWiki 3.0, which will be released in April 2009. The main focus of version 3.0 will be further enhancements to the user interface, the admin interface, the theme system and built-in themes. Additional goodies include webservices and enhancements to the plugins.