is appropiate
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second person means using "you" right? so when would be a good time to use "you" when writing?
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you cant write in 2nd, only 1st and 3rd
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What if your writing one of those "role-playing" books. "You walk into the room and see old paintings and an antique vase resting against the far wall. You decide it is a waste of time to look any further and decide to leave..." One of those.
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I've written in second person before, just to make a story different. It's not usually supposed to happen in standard forms of books, but the fun thing about just writing is that you get to mess around. I wouldn't advise you to do it in any sort of piece or book unless you are doing it in a role-playing book or if you just want to experiment. Personally, I think what I wrote that's in second person is one of my best pieces. And I usually hate what I write. So... it all depends.
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Often second-person strives to make a story more immersive (make it seem more "real" to the reader and involve him/her more in the plot). You mostly find it in choose-your-own-adventure "interactive" fiction (still being written, actually; there are communities like this one devoted to such online http://www.infinite-story.com/ though you may have to sift to find good material). As for novels, other than that brief surge in popular choose-your-own-adventure novels, mainly for children, Wikipedia lists these: http://en.wikipedia.org/wiki/Point_of_view_(literature)#Second_person