I don't seem to find anything serviceable in the native Mac OS or ICal. I'm looking for a utility which can pop up and give me a small reminder to do a repeatable chore. I need to accomplish a few a day, every day.
I use the MS Outlook calendar extensively and routinely set my items with a 15 minutes reminder. Outlook allows many custom functions for appointments (a/o, many types of repeat). I sync it with my iPod Touch.
So, between my computer and iPod I have all the scheduling and their reminders I need.