Well, I mentioned this
here recently, and people seemed rather interested. Since I've enjoyed writing it, and I'm sure to learn from any people's advice on what I did wrong, I stuck my download script on GoogleCode.
http://code.google.com/p/xadownloader/
It requires python 2.6 and WxPython, but it does let you download all the works of an artist or artists from Deviantart, HentaiFoundry, Furaffinity or hArtists automatically.
If anyone has questions, I'm happy to help. I'm working on getting some docs up on the googlecode site.
Also, if anyone is interested in other sites, I will consider that too.