Al Leiter,
originally uploaded by Johnnyjets.

I would rank Citizen's Bank Park ahead of Arizona, but behind Houston, my all time favorite new ballpark. But here's probably the best feature of Citizen's Bank Park - the fans can get right up close to the bullpens. (I was actually much closer to the bullpen, but only remembered to take the picture after we had walked away a bit.)
The funny thing about these bullpens, which you may have heard already, is that the Phillies currently occupy the bullpen on the left, and the visiting team uses the one on the right, where you see Leiter warming up. At the beginning of the year, the reverse was true - the Phillies used the bullpen on the right. So at the beginning of the year, when the Phillies were struggling, in particular, the Phillies' bullpen, the fans were merciless. (Phillies' fans are known for being very merciless.) They were so merciless that the Phillies switched bullpens so that they were farther away from the vicious fans. But it's a neat attraction for visitors. Also, behind the bullpens (behind where Leiter is), is a little Wall of Fame, with plaques, and a wall commemmorating Phillies history. Also nice.