Project Status:

GAddBook is an application designed to enable interoperability between various contact management systems, such as Google Contacts, Microsoft Outlook, and generic CSV and other address book formats.

Until I find a better format, I will be using a custom XML format to store data, which I will post here.

Initially, I will code this in PHP for proof-of-concept, but eventually I hope to make it a "real" application in Java or C++.