Shame it wasn't a wholesale jump to the Catholic Church instead, but it is definitely one for orthodoxy. The diocese of San Joaquin, California, is now within an Anglican province in Buenos Aires, and remains within the greater Anglican communion under Canterbury. I had to laugh at the New York Times' report that this diocese "has long been different from the rest of the Episcopal Church". That certainly sounds nicer than the truth: that the Episcopalian church in the US has been shifting away from orthodoxy in less than one century (probably less than half a century), and the San Joaquin diocese had simply resisted this shift.
May the Anglican communion go even farther seeking greater orthodoxy, always seeking Christ, the true object of our fidelity. During lunch, David of Sentire cum ecclesia explained a model of Christian unity I hadn't really thought of before. It is not so much that the non-Catholics should seek to become Roman Catholics, but that, in truly seeking the fullness of communion with Christ, we will inevitably end up being in communion with the Roman Catholic Church. That's how I understood him anyway, and that sounds about right.