I was heavily into the fandom after FotR came out (and was basically raised to it by my mother -- read the covers off The Hobbit as a child, and read LotR many times once I found Mom's missing copy of FotR, watched the crappy cartoons Mom taped off cable, and my first two dogs were named Frodo and the last one named Bilbo). Burned out by about the time RotK came out. Don't have any good links handy, I'm afraid, beyond suggesting browsing on archiveofourown.org. (I completed exactly one story in the fandom, Frodo/Sam/Rosie. I was a Pervy Hobbit Fancier and proud of it.)

The fandom is in limbo right now, but filming on The Hobbit is due to begin soonish, and there's starting to be rumblings of interest on TheOneRing.net as photos and press conferences and news items trickle out. I'm really looking forward to the new pair of movies -- quite aside from trusting Peter Jackson to do something beautiful with it, Sherlock fandom has primed me to view Martin Freeman's work fondly.