Well, it took about 19 hours, but my book Twilight Candleflies is now visible in Amazon's Kindle Store! I think I still need to figure out how to make the cover look better, and the paragraph indentations didn't do as well as I'd hoped, but overall I'm happy.
I've also submitted an ePub version of my story to Barnes & Noble's Nook Store. According to them, it should be downloadable within 24-72 hours.
In the meantime, here's the cover artwork for Twilight Candleflies. My girlfriend did the amazing painted artwork in the center of the cover: