Same as Pitt the Elder - every other Canadian team besides the Flames to a certain extent. It's mostly fan-related (obviously there are exceptions in all cases), but the Canucks and Habs have been pretty easy not to like based on their style of play as well. I've never been much of a fan of the Penguins either. Call it jealousy if you want, but something just irks me about how their entire team history is more or less based around being completely terrible at the right times and getting some of the best hockey players ever to carry them to championships. It's like having a friend win the lottery, watching him turn into an uppity ******, and just when he's about to get what's coming to him.... he wins the lottery again. I guess it is jealousy.
Also the Sabres. Formerly because of crybaby Lindy Ruff, latterly because of crybaby Ryan Miller and the idiots they employ now in Ron Rolston, John Scott, Patrick Kaleta, etc. In general there's just a sense that they lack respect for other teams, from Lindy's "no goal" speech to Rolston sending out Scott to beat up one of the league's top forwards in a pre-season game. Sending Kaleta to the minors seems to be a sign of things to come though, and they're putting together some pieces that could give them a solid core for the future, so who knows?