I made small pocket folders from large-sized, on-sale ones and stamped the tabs with the month names. Each month contains the names, birthdays, anniversaries and address which belong there. I think I should be keeping a list of what handmade gifts I send each person, too, in case I want know from year to year.
I don’t think I can adequately express how much I love being organized and how much I love getting that way. Small-sized orange binder from my fav Japanese book store, Kinokuniya.