If I wanted fat, I'd just have a slice of bacon or some nuts with my coffee. I've not tried the butter thing, but I don't generally like anything in my coffee.
One thing I've started doing is having mixed 40/60 regular and decaf in the morning so I can drink a bit more coffee without too much of a jolt. Then I'll have a "real" cup of coffee later in the morning and it staves off my desire to eat lunch too early. Caffeine is generally minimized afterwards.
