There are a few seasonings which go pretty well with my coffee: chocolate, cardamom, cinnamon. I once had a marvelous coffee at Frontera Grill that was brewed with cinnamon and orange and lemon peel, and served with brown sugar.

I'm not morally opposed to the stuff, but I think the main problem I have with most "hazelnut coffees" and the like is that they tend to be made with really lousy coffee beans.

Then there are the flavors that are just OMGWTF. I am finishing up some lavender coffee that coastergalwdw brought me back from Seattle. Neat idea, but --- wow. Weird.