Hey, I'm one of the founders of Wesabe. We launched a week ago, so we haven't added joint accounts yet, but we plan to add this as a pro feature very soon. I agree that this is definitely necessary -- some families have all the finances managed by one person, but many have shared responsibilities. You're absolutely right that a shared logon is not the right solution! If you have any requests for how you'd like this to work, just let us know at support@wesabe.com. Thanks for the feedback!