I drink my coffee black, so I've never been concerned about it from a weight loss perspective, but earlier this fall I did stop drinking it for about 8 weeks, as I was concerned by how dependent I'd become on it.
The short version - I started drinking coffee again by the beginning of December, and was happy to have it again.
I love the taste (good black coffee, to me, is delicious and saisfying) and I am a much more pleasant, energetic person after my morning cup. I'm trying to stick to a total of 24 ounces (2 of my 12 oz. tumblers) a day, but that's not unreasonable.
Personally, the only positive side-effect for me of going off coffee was that I had no caffeine related headaches. As it is now, I occasionally get a headache on Saturday mornings, when my morning cup is delayed by a couple of hours.
Also, and in the realm of TMI (sorry!) my bathroom habits are much more regular when I'm drinking coffee. This is true even if fiber and liquid intake and exercise are the same, so the only thing I can attribute this to was the lack of coffee.