Someone mentioned Jarkko Ruutu. I disagree 100%. Sure he sometimes acts like a monkey out on the ice, but the off-ice-Ruutu is possibly one of the smartest hockey players out there. I'm sure the finnish writers remember the Rouvali-case, when J.Ruutu flew him over to watch the Olympic Games. He just has a role on the ice that he has to live up to.
Just like the previous poster said, all three Ruutus are known to be pretty smart and Selšnne ain't particularly dumb either. Raimo Helminen, thats one guy I might call dumb based on his poor oratory skills.
Odjick definitely if we're counting players no longer out of the NHL. If you include coaches as well I think Daryl Sutter and Jacques Demers would have to fight it out for that honour.
Sutter is brilliant. He does come off as stupid but if you listen to him and really watch him you can see how smart the guy truly is. His sense of humour is so dry but the guy makes me laugh, he's pretty damn quick