Social, school, etc: Old fashioned paper calendar on the side of my ice box. I also take pics on phone of school posters, etc., e-mail them to myself, check inbox, then add to paper calendar. Works really well. I also have mobile phone alarms set for 6 days of the week multiple times a day to keep me running on track (school pick-ups, minimum days, wake up, church, volunteer commitments, etc.) We tried Google calendar but it was too much of a hassle. He has a tendency not to record dates either way.
All bills: Husband, with only bi-annual property tax due date nagging courtesy of moi because of paranoia he won't receive a paper notice to pay as has happened just one time and which I can not let go of.
Shopping: All grocery and meal plans - me with a paper list. All Target and Costco - him with a digital list on phone.