Hentai-Anime Image Board?

Does anyone recommend good image boards like Danbooru for ecchi, anime and hentai images?

These are the one I usually visit:

http://www.nihonomaru.com/chan/
http://gelbooru.com/

I'd suggest reading forum #14897, as talking about these kinds of things is not what the Danbooru forum is for.

And for the record, I think Gelbooru is just awful - and the first site you linked doesn't look like it has much going for it either.