As someone who has watched the show for two years, but just discovered the fandom behind it, do you have any good links for me?

I'm looking for a nice collection of back-story and descriptions that aren't canon per-say, but were created by bronies! Like... all this stuff about Octavia, Vinyl Scratch, or Roseluck. Obviously you guys seem to have lots of ideas for development of these characters, as well as theories and things about the mane six. Is there a nice, collected place where I can go to read about some of these?