I feel weird not to have posted in this thread at all in 2012... Wow.
Well, about a month ago I put a horror short story on Amazon just so I could get a feel for the process and I'm pretty pleased with the $7 I've made. It's more than I've made in the past for writing!
Putting a short story up on Amazon doesn't strip you of your "debut novelist" title, right, because it isn't a novel? Just checking.