We use it by scrolling through the 'already shopped for list' and just tapping the items so they appear in this weeks list, and yes the crossed off list gets sooooo long it becomes useless. Would love it if they had the 'delete duplicates' feature. All in all I love this programme though, and can't believe other shoppers around me are still using paper lists!!! For a start, I don't have to try to read someone else's scrawled writing with this programme. And I have it colour coded to my route around the supermarket.