Haha! Me completing projects tends to motivate Mr. Bramblefir into helping out or finishing his own projects. He keeps his own little "reminder" list that sometimes crosses over into my "to-do" list.
I used to lose mine when I wrote them on scraps of paper. Now I use a big notebook (the sort used for school) and keep it on my primary work area in the house. The only other things that occupy my work area are my laptop and my current knitting project, so it's pretty hard to lose.
Put them on a 3'x5' calendar, what my 76 yr old father in-law does, everything goes on that calendar, temp, snow fall, day the peepers start peeping, first day he notices a Robin in the spring, when he plants what, when he changes the oil in his vehicles....can't lose a 3'x5'...
I make similar notes too. What went into the ground and when, harvest amounts, livestock birth and breeding records, illnesses, appointments, meal plans, budget notes, first frost, etc. A separate notebook up at the barn records flock egg counts, setting and hatching dates, etc.