POP for me.
To give some perspective, the other most-listened to albums, in order, would be Zooropa, Achtung Baby, and The Unforgettable Fire, and Boy...at least for now. I listen to 'em all, but I can already play them in my head without the CDs anyway. These four still get the most spins at this point in time. This despite the fact that they, too, are entirely committed to memory.
This is a great idea for a thread, by the way. And I get the feeling that people are being honest, rather than saying, "Well, this album is my favorite...so I listen to it the most. Fuck you." POP isn't quite my absolute fave, but I do listen to it the most. Rock on, everyone. I hope people continue to contribute, here.