SkyDeck: Analyzes your phone bill and tracks relationships

It has raised $4M. SkyDeck matches your contacts (from Outlook, etc.) with your phone bill and analyzes your calls, texts, and e-mails. It then gives you the power to see when you've last talked to someone, sort contacts by frequency of communication. You can also build apps, like billing applications to bill your clients, for example. "Beyond social networking and bill management, SkyDeck also offers a powerful API with a large number of practical applications. Included in the list of apps that are possible (though still hypothetical) are comprehensive lists of communication you’ve had with your peers, including Email, text messaging and voice - something that would be a boon for businesses that have to manage a large number of clients."