Ethan Watters's "The Americanization of Mental Illness" in the New York Times, January 8 2010, and
Louis Menand's "Head Case" in the New Yorker, March 1 2010.
My personal favorite quote from the latter:
"In the Hippocratic tradition, melancholics were advised to drink white wine, in order to counteract the black bile. (This remains an option.)"