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I don't think the Hottentots are the smallest, but they are pretty close.
I think Call ducks are one of the smallest domestic breeds.
The Hottentots are just barely larger than the white winged doves in my area, and are very quiet, but wild, so i can't really pet them unless i want them running away from me. 
There are only a handful of registered breeders for them in the US, but fortunately they only cost a little bit more than your average pair.
I have several pics of them in my thread in my signature. I think a majority of the duck pics are on page 9 and 10, although I will try to post the best ones i have of them in here:
For sizing reference, the white and blue feeding bowls are just regular dog/cat water and water bowls.
The 2 ceramic bowls inside the white bowl in one of the pics are the kind of dishes you would have in a hamster cage. I have to use 2 ceramic bowls, because the tiny ceramic bowl is what i put their food in and will float around in the water dish by itself. So i put it in a slightly larger ceramic bowl to weight it down.