Nephrite (now closed)
Fanart Sites That Have Specifically Denied Permission
Fanart Sites That Have Not Responded to My Requests
Probably some others that I've forgotten. Note to self: ask Keroyon for permission.
Fanart Sites That I Know Don't Give Permission
A2 (or so I've been told, although the text on the index page makes it seem like she's willing to give permission if asked)