I enjoy using a plain text file as my to-do app. Readable on a Mac or a Windows machine, no need for Internet access, infinitately reconfigurable depending upon my mood and the organizational scheme I need to use for the moment.

But.

There's one golden functionality I've yet to be able to reproduce, and I'm not sure how it's best done.

I used to use Life Balance. It's a nice app, but the problem is it's been in a pretty much eternal code- and feature-freeze for a few millenia now (much like BBSW's Mailsmith, although that tool remains my mail client because it still offers functionality no one else does).

One of its fantastic features is that you can tell to re-present you with a task a certain amount of time *after you've checked it off*. So let's say you want to empty the cat's litter box every seven days (don't wrinkle your nose, crystals don't need daily changing) -- but you let it go for a few weeks. Traditionally, you'd get bugged with three or four weekly reminders from a traditional to-do list app or from a calendar alarm. Life Balance would let it remain on your to-do list and then, when you check it off, start the timer again.

I really don't know how to reproduce that functionality anywhere else. I'd love to somehow mind-hackingly integrate some sort of similar accomplishment into a normal plain-text-file to-do-list universe. But I would have no idea how to go about it.

Would appreciate your gleaming insights.