Interesting! NSync was my first RPF fandom (it was *everyone's* first RPF fandom, RPF was so taboo until then) and I strongly associate it with fandom's explosion of really, really, really good writing. There was a lot of experimental flair (so and so turns into a girl, so and so is a hooker, they're all guerrillas in an unnamed South American country, AUs galore, the invention of holiday fic exchanges) and also a lot of really good solid love stories. Have you found Helen yet?

http://helenish.talkoncorners.net/stories.html#pop

then there's

http://www.waxjism.org/jaesepha/stories.html (especially "Coldhearted")

and

http://strangeplaces.net/torch/boybandstories.html

and

http://yearningvoid.net/insanity/