Decided I would contribute some games to the list, these can all be found by searching on Hongfire.com. All of these are what I would call non-mainstream works. They are also games that I liked a lot, so I really do suggest trying them if possible. A word of warning though, on one of my computers, a really nasty virus was installed through an exploit with acrobat while browsing Hongfire, so I suggest putting the site on the restricted list for Internet Explorer.
Erotical Night - Flash game, sex battle system (Defeat girls by making them climax, don't let the same happen to your character).
Nightmare Sphere - Castlevania-type game with h-game elements when knocked down by enemies.
Nano Crisis - Action game, similar to above in that getting knocked down leads to H. In an alpha state right now, but I'm excited as it has a lot of potential.
VH - RPGmaker game, a ton of good, but primitive H-animations with a lot of emphasis on, well, violation of the herorine. Modding the game is what gives the game potential IMHO.
Robozou - Mind-control flash game. A remake is in the works but the original is pretty good. The loli content is a turn-off personally, but the control aspect is fun and its great controlling the "mom".
That's all for now, please enjoy.