I did a clean wipe of my system, and when I installed Photoshop CS3, I noticed that Arno Pro is installed. I can't find it on the Adobe website, nor on Myfonts.com.
It's similar to Adobe Jenson, but not as "earthy." But now, there is no Jenson, which is one of my favorite Adobe Originals.
(EDIT: Did I forget to put a space there?)
And what else is known about it?