Thanks to lil_shepherd on primeval_denial, I discovered an excellent resource (http://www.isfanficlegal.com) covering all of the Ebooks Tree issues. While on this site, I read that Ebooks Tree had removed at least some of the stories it had stolen from AO3. I did a search under my own fic pseud and found that my two stories had been removed. :-)
If you have any works on AO3, I would suggest that you search for your AO3 pseud (and maybe any other creative aliases you use online) on Ebooks Tree. If you find any of your work there then send a message to Ebooks Tree asking them to remove it. There's a helpful email form you can use.
Crossposted at http://rusty-armour.dreamwidth.org/135025.html