The usefulness ramps up to another level when you start using the system to remind you to reconnect with friends and business contacts. You can tell Etacts to remind you to contact your professor once every year or your friend in VC every month. It will e-mail you these reminders.
The killer feature is Gmail integration. Within your Gmail, Etacts will integrate with your e-mail and remind you if someone hasn't followed up with you, display social media contact information, and provide a general overview of your contacts.
The website is simple and still sparse, but with a bit of effort, Etacts could become a central hub for contact management. The company believes that people will eventually spend "hours a day" within Etacts, because it will be your gateway to your friends.