Special pages that are updated by the updateSpecialPages.php cron jobs have not been updated on any Wikimedia Foundation wikis since approximately 4 Feb 2009. On 12 Feb, Brion posted on wikitech-l as follows:
Last week some of the background batch jobs were reorganized to run
under a less privileged user account, a good security practice.
Unfortunately the log files the batch jobs logged to didn't have their
ownership updated, so the batch jobs were unable to actually run, due to
being unable to open their output files. :P
I've fixed the file ownership; they should start updating in the next
day or two per regular schedule.
However, it has been 5 days since that posting, and the jobs are still not running, so apparently there is some other problem.