Does anyone know of a good iphone app for simple checkbook balance keeping?

No need for fancy features, just show the running balance, let me enter transactions, and keep it synced with my wife's iphone.

We've got an app call ourgroceries that does this simple syncing using a single email address which would be WONDERFUL if we could find this type of functionality in a checkbook app.

I've seen a few apps that will sync with bluetooth, but that's not too helpful if we're on opposite sides of town, looking at our running balance,

Have you tried Mint.com?

I believe they have an iPhone version of their app and it will automatically sync with all of your accounts, let you view/enter transactions, etc.

Plus, you'll be able to access it from your desktop/laptop for additional information/functionality.

Good luck!