Along with the usual lists Amazon offers (the bestsellers, Listmania, etc.), they've come up with a rather strange one: "Most Highlighted Passages of All Time".
These would be limited to passages highlighted by Kindle users, of course. Making the name of the list is a bit suspect, since the Kindle hasn't been around all that long (plus Kindle users are still a fraction of the reading market).
I'm not sure which is weirder -- the subject of this list or that Amazon is keeping track of what customers are highlighting. Big Brother, anyone?