As a retired judge, O'Connor maintains an office at the Supreme Court, still draws a salary and fills in as a judge on the federal appeals courts.
I know that retired judges got to take "senior status" and would sit by designation on appellate panels, but somehow it never occurred to me that Supreme Court judges would do it too. That's got to be a little bit of a letdown. What if she's on the bottom of a 2-1 decision? "I used to own you people!" It would just be a bit rough on the ego, I think.