What software or system do you guys out on server fault use to remind you to do routine maintenance? How do you checklist and log the various items you are supposed to check? Do you have an internal process document? Do you have cron mail you every week with reminders to check system logs?
Also, do you work on a team to do system maintenance, and if so, how do you coordinate who will do what maintenance?
If you use a bug/issue tracking system to enter tasks, do you have a cron job enter recurring tasks?