The Atlantic: "What is the most important Supreme Court case no one's ever heard of?"

The Atlantic Magazine asked a number of "experts" (law professors, lawyers, judges, authors, etc) for their opinion on the most important, yet not widely known, Supreme Court case.  Their responses are very interesting and you can read them here.  One author picked Strickland v. Washington, stating that

Decided in 1984, Strickland v. Washington created a procedural rule that makes it virtually impossible for a criminal defendant to successfully argue that he or she has been denied the “effective assistance” of counsel—and thus the Sixth Amendment right to a fair trial. The ruling is directly responsible for thousands of Americans’ incarceration after trials in which their lawyers drank, or were using drugs, or were sleeping, or were otherwise clearly incompetent.