I just got my first debit card, as did my teen son. I'm wondering what works best for you keeping track of payments, credits, checks, etc? I hated using a check registry and what worked best for me was using duplicate checks and keeping my total there on the carbon, then lately using online instead of monthly statements. I don't do online bill pay (yet), and still will be writing checks for school, etc. I can't imagine my teen carrying around a check register, so ideas for managing that would be appreciated. What's working for you? I know I'm in the dark ages still writing so many checks, plus twice recently I've ran out while shopping so it's been a pain.