One thing we do Geoff, is not have a lot of money. 🙂
Something I want to do is “refresh” and get all new numbers for our accounts periodically.
I also want to set up a “paranoid” card — for things like travel or little cheesy untrusted establishments. This gives us some fraud protection, and damage control. A debit card can be set up attached to only a single account, for example, I have a personal account not tied to Leah’s and my joint account, or savings. I use this for smaller transactions or for sketchy places where I need to use a card.