Separated, But Never Divorced?

The New York Times on some of the reasons that some folks (including, apparently, Warren Buffet) continue in marital limbo, for years, and in some cases, decades. The record, in my own practice, was a client who had cohabited with his new spouse just long enough to conceive, and for her to give birth to, a child; now that their son was finally reaching adulthood, they thought it would be a good time to finally dissolve the marriage...