"Some hatred" = second best rivalry?
and may I ask what history did the great rivalry of Pittsburgh vs Washington have aside from meeting of Ovi vs Crosby and Malkin on ice?
Let's be honest, in hockey the tradition is that whatever is interesting at some moment, it is a rivalry. Minsk - Riga will always be rivalry due to history, Riga - SKA games are always tough after our win in play-off some years ago, even this year when Dinamo Rīga sucked everyone remembers this:
http://www.youtube.com/watch?v=b3_1y2Fg5MY
Riga - CSKA is also a rivalry due to history, Riga - Moscow Dynamo mostly due to Znaroks coaching them (also it's the ''same club system = both teams being Dinamo/Dynamo stuff though I don't think anyone cares in modern times)...
Though I'd say everyone wants to beat SKA, so for every team meeting SKA could be a rivalry