Reddit user 1000Vultures wrote 6 short stories that later became a short book. Easily my favorite from nosleep. Start with 'footsteps', and then each story has a link to the next one at the bottom.
The Internet story is a classic. Really creepy... The top stories of r/nosleep are super creepy too. "Autopilot" is a must read if you like that kind of stuff. Also, Welcome to Night Vale is a nice podcast in the same genre.
If you are in the mood for a buttload of creepy pasta, check this thread out: http://www.reddit.com/r/AskReddit/comments/1hzo8p/whats_a_st.../ The very best of the best of creepypasta. I read it at work and I was still creeped out..
How can you talk about fictional TV shows/episodes and Creepypasta without mentioning one of my favorites, Candle Cove? Edit: Oh good, found the Candle Cove part.
Sometimes I think creepypastas are the best thing to come out of the Internet.. Then when I can't sleep at night I think they might be the worst thing to come out of the Internet Then I remember not being able to sleep at night is exactly what makes it the best thing on the Internet.