I've tried various things, but what I've used for the past couple of years is a notebook for each of us filled with our current memory work as well as everything (or almost everything) we've learned over the years. I have them arranged by categories with dividers: Bible, hymns, poetry, history, English grammar, etc. Last year I used a review sheet based on Ladydusk's (hi, Dawn!), but this year because we are out of the house much more than we were last year, I shoot for 3x a week of us actually going over the new material, and I just go back and review the next thing behind the current piece from each section. Does that make sense?