It was déjà vu all over again when the government released the April employment report on Friday. The latest figures show that the economy added 274,000 jobs last month, some 100,000 more than had been expected, and that 93,000 more jobs were created in February and March than had originally been reported. The numbers are surprisingly upbeat and entirely welcome. But we should remember that a year ago, in the spring of 2004, the story was much the same. Back then, after more than two years of relentlessly subpar job creation, there was a three-month surge in job gains. Then,...