The screenshot also links to the demo; I fixed the text link, but heroku won't accept my commit. I'll try later.

If you test on chrome, you'll see I'm using the html5 placeholder attribute on the new list form, which provides instructions.

A planned feature is to have a secret edit link. For the mean time, you could create a new list, though I know it could be bothersome.

Those links save a cookie that remembers the items you already checked off. Save makes the cookie, restore restores it, and clear deletes the cookie.

I'll definitely do the bookmarking thing.

Thanks a lot!