Smashwords. I've hit Go for the print version as well, but that takes longer to process so it will be a week or two before I'm able to go ahead with my next Goodreads promotion.
I particularly like the detail on the SGM cover, and it is both spectacular in thumbnail and well worth the full view - it would be a pity to miss out on the lovely glimpses of Eferum-Get in the background, or the way Rennyn's ribbons are twined around her fingers. This time I even managed to make the title legible in quite small thumbnails.
My launches are all quiet ones, since self-publishing doesn't really lend itself to big launch parties. You press Go, you wait for approval, and then you wait several weeks more while the book's listing trickles out to other sellers. You don't really want to make too large a fanfare if readers can't even find the book listed. Medair and Champion still haven't reached The Book Depository, which is my benchmark of "available" (since that's where I buy most of my books). And, of course, there's only a limited amount of fanfare you can indulge in as a self-pub without making yourself obnoxious.
Still, the quiet approach gives me time to adjust to the learning curve involved in all this. And, of course, edit the next release (Touchstone! So BIG!).