I've been drooling over the Fancy Diacritics group recently, and got to think about what it is that makes a typeface suitable for editorial work. News faces often raise the x-height, retract the descenders and tighten both spacing and letterforms, and wierd (and sometimes wonderful) variants of cap+diacritics are often deployed by the tabloids to set lines even tighter. Magazine type is less gross, with elegant logotypes, ligatures and alternate letterforms. Anyway, let's get to the point.
For the type designer: Which alternates, ligatures or treatments are clients most often requesting? Which ones do you find most interesting yourself?
For the graphic designer: In a display face, what kind of sprinkle do you find most useful in editorial design?