With the rising interest in, and use of Social Networks (FaceBook, Plaxo et al) there is growing unease in what those sites are doing with your data, never mind the inconvenience of uploading all your data every time you join a new site.
Enter Dataportability.org a site whose philosophy is:
As users, our identity, photos, videos and other forms of personal data should be discoverable by, and shared between our chosen (and trusted) tools or vendors. We need a DHCP for Identity.
An eminently laudable aim. See more about their aims on this quick video.