They could at least tell you which account has been signed up. Everything's so easy with 1-click, but now that I have multiple accounts signed in at the same time, I have no idea which one requested the invite and I'm going to have to continue to watch _all_ my inboxes... if it has an Android part, which it better, I sure hope I've linked the right account to the invite so that the device can download the app.
grumble grumble
It actually looks cool though.