Just so you guys know: Hentai is usually referred to as "H", i.e., "H Manga" "H anime", etc.

Ecchi is the sound of "H" in Japan. XD So technically, it's the same thing. However, ecchi is usually used to describe more softcore things (obviously) - just panty shots and things.

Hideki: www.hongfire.com has some hentai games, if that helps at all. Actually, they release a lot of H games and H CG packs, so that should satisfy you. It's not anime, but..

BoxTorrents had a hentai section, but the page has been down for a while, so I don't know if it's down for good or not. X3 But I think hentai is pretty easy to find! Just look in P2P programs, I guess.