Just a random something I'd like to say, as you mention the rivalry:
This thing with Bayern is pissing me off a bit, I have to admit. Until two seasons ago, nobody gave a flying heap about when BVB played Bayern and all of a sudden it is made up to be this huge rivarly that is bigger than Schalke vs Dortmund or Hamburg vs Bremen, in regards to history and everything. It is nowhere near something like a clasico and it will take some years until it is close to it (they don't call it a clasico without a reason and so far, there is a distinct lack of great derbies and stuff). If Dortmund can keep it up, then yes, in a couple of years we will have something like a big rivalry but for now it is, at least to me, just the two best clubs playing against each other. Overhyping at its best.
That being said: I maintain that Dortmund does not have the best fans in the world, otherwise they wouldn't do stuff like that.