Every sport has interim coaches. Hockey, though, often seems to have no other kind. They're not all identified that way, of course. NHL coaches who get tagged as "interim" when they're hired generally lose either the label or the job within a few months. Still, long-term job security is a virtual oxymoron in the league, where spending three or four seasons behind the same bench practically qualifies a guy for a lifetime achievement award. That certainly is true with the Penguins, who have had 22 coaching changes since Red Sullivan ushered the franchise through its first two winters. The most recent came Feb. 15, 2009, when Michel Therrien -- who had guided the Penguins to within two victories of a Stanley Cup the previous spring -- was jettisoned in favor of Dan Bylsma. Bylsma promptly lifted the Penguins out of a seemingly hopeless morass and, a few months later, to the championship that had eluded them in 2008. Bylsma is less than two weeks from finishing his fourth year on the job, a run without equal since the Penguins entered the world in 1967.