I went to the Holy Donut in Portland last Friday, which was National Donut day. I arrived pretty late (around 12:30), which meant that they were almost completely sold out. All they had left were some gluten-free cinammon/sugar donuts, so I decided to buy one, even though it definitely wouldn't have been my first choice.
I'm happy to report that the donut was still excellent. It was moist, sweet, and I probably wouldn't have known it was gluten free if I hadn't been told. It's made w/ potato (like the other donuts) and rice flour.
Anyway, if there are any gluten-free folks out there looking for a good donut, definitely check these out.