Cron on Agaric's MayFirst servers
The cron jobs for each web site are created as the user associated with that web site: the user accesses it with the crontab command
To see what cron jobs that user has, which should contain the "drush -r /var/local/drupal/exampleuser/web cron", where exampleuser is the site project name (which may or may not be identical to the username, but is in any case owned by the user).
The admin (root) can see them all in /var/spool/cron/crontabs
grep -h \* /var/spool/cron/crontabs/*