Over on The Sweet Setup we just posted our latest app review, and it’s for shared lists.
We chose Wunderlist as our favorite because it has great apps for every major platform (so you can share your lists with folks who aren’t as Apple-nerdy as you are), it has great and reliable sync, and a lot of extra features to make collaborating with others very simple.
Or if you want something more basic (like just one, maybe two, lists that you and your spouse share), then Apple’s Reminders may be the way to go.