"To be or to be." That's how one of the most famous sentences in the English language began several years ago in a new edition of Shakespeare's "Hamlet." Six professional proofreaders failed to catch the mistake, which received national publicity and gave the publishing company a red face. Similarly, the Wall Street Journal once devoted eight column inches to ridiculing a conference on critical thinking that sent out a press release referring to the conference's "world renown" researchers "in.