anologue: A Hate Story is worth looking at, some nice interactive elements to it and an interesting cultural basis/inspiration.
Played that a few weeks ago and liked it a lot. Christine Love's writing is always good, and I enjoyed piecing together the story of what happened to this long lost spaceship. Also asks some pretty interesting ethical questions, and the fact that it
literally asks them, since it's a game, made me think about them more than I would have if I were just reading a novel.
anologue: A Hate Story is the spiritual sequel of Digital: A Love Story (see what she did with the names? Isn't it clever? I don't think so either

). Digital is about hacking and the internet as it existed in 1988. It's a very unconventional VN and is definitely worth checking out. Also, it's free.
In fact, anyone who's interested in trying visual novels should probably check out Katawa Shoujo, Digital, and Narcissu, since those are the best of what's free.