As much as I hate to say it, the Pens arguably have the best fans in the NHL. They are super supportive and will go almost anywhere when they play. There were a number of Pittsburgh fans from Pittsburgh in DC when we played them in the 2nd round.
We've gotten rowdy lately in the Verizon Center, but a lot of it because of the recent success of Ovechkin, Green, Semin, etc. We have to continue this success and get back to the Finals if the Caps want to be mentioned objectively as the best NHL fans.