I am starting to upload my fic to Archive of our Own today. I like that you can import from existing links. I also like that you can backdate the stories so that they won't all look like they were written today.
I'm going to start with the fandoms that I only have a couple of stories in before tackling my BtVS and Heroes works.
I am dragonydreams over at AO3.
ETA: This is going to take forever if I keep reading the stories as I post them. ::headdesk::