I'd love to find a way to securely share passwords with mobile devices. But from what I understand, there's no very secure way to do it on Android. If you store a private key on the device then other applications may have access to it. And with iOS, each app is its own silo, so I'm not sure how you'd get password autocomplete working. An ideal solution would allow selective sharing because there are some secrets you wouldn't want stored on your mobile device.