Excellent question!
amoretonline is going to publish one of my flash fiction stories. I appreciate that, and hope to get them to publish some more of my work as well in time.
Dreaming Blood was an excellent site, although it seems to be down. If it doesn't come back, I will sorely miss it.
That's about all right now... not many, but I hope to add more to this noteworthy list if I can find places nice enough to take me on.