Paper people: How do you manage recurring tasks?

Those of you who use a mostly paper system, how do you manage recurring tasks? I'm thinking more menial stuff like changing your furnace filter, watering plants, et al, that you might need to do once a week, every month, etc.

I've been using kGTD lately and really appreciate the way it distinguishes between tasks that recur after a certain number of days no matter what, and one that resets a certain number of days after you last completed it. How do you manage something like this on paper, besides (the horror!) remembering to repeatedly write them down?

I just write tasks to...

I just write tasks to be done on a given day in my hard landscape. It might look something like this:

O Take out trash - 1wk

When I complete the task, I check it off. the '1wk' reminds me that this task occurs again in 1 week, so I copy it to the new date. I also use 2wk, 1mo, etc. This system works great for tasks that must be done on a given day. Any task that has no strict deadline (changing the furnace filter, for example) goes into my tickler to remind me to place it on an NA list when the time comes.