I'm a big fan of Fernet. It's making a huge comeback (at least in MKE). I see it all over the place, a couple of bars I frequent have a $5 deal of a shot of Fernet and cheap beer. One bar does the SFO style of giving a ginger beer chaser with a shot.

And while it's mostly Fernet Branca, I've started seeing Leatherbee Fernet also. It's a Chicago based distiller.