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In the meantime, you may want to pick up one of the new U.S. Supreme Court biographies. You have a choice between "Justice Brennan: Liberal Champion," by Seth Stern and Stephen Wermiel, or "Sonia Sotomayor: The True American Dream," by Antonia Felix.
Or if you're in no hurry, you can wait for Justice Sotomayor's forthcoming autobiography.
(h/t How Appealing)