the football rivarly just isn't there at all. hockey is where its at and where it will continue to be.
Yeah, the fact that the teams are in different conferences prevents any type of rivalry from forming and I personally feel neutral about the Eagles. I found myself actually cheering for the Eagles last year in the Super Bowl (but that does not say much, as I would cheer for anyone against NE). As for baseball, there used to be more of a rivalry back when they were in the same division but I guess there still is some. However, the fact that the Pirates are a de facto minor league team doesn't help. The rivalry is definitely in hockey

. Also the fact that the state government tends to favor the eastern part of the state, especially the city of Philadelphia, over the western part of the state, helps to heat up the rivalry from my standpoint.
I still remember the Primeau goal in 2000. I had just graduated from college and didn't have a job yet so I was able to stay up until 2 in the morning or whenever it ended. The ending was painful, especially since the Pens had won the first two games in Philly

.
Although my earliest hockey memory goes back to January of 1985 (Lemieux's rookie season), when I was in first grade, I first really became a fan of the game in 1989 (when I was in fifth grade), when the Pens and Flyers faced each other in the second playoff round and the Flyers won in 7 games. It was then that I learned that the Flyers are "the enemy".
One of my favorite memories of the rivalry was the 2006-7 season, when the Pens beat the Flyers 8 times over the course of the season, with at least one Crosby hat trick in Philly

.