Yet Again with a Little Extra Help (Naruto continuum). This was back when I thought Naruto was the bomb, but it's still pretty good even when I've lost most of my interest in the series. The characters are pretty Stu-ish, but I occasionally really enjoy reading about someone coming in and fixing all the crap Kishimoto inflicted upon us poor fans.
Also, it is funny, and funny is good.

Usually, I'll read through something that's not complete, and then it'll update after a while, so I re-read the whole thing to see how the new information fits in (like History of Magic in PMMM.)

Discovering a new fandom for me is always like discovering a stash of food I'd forgotten about during paper-writing season. I tend to go back to a few perennial favorites now and again, either because I'm bored or can't find anything new and good, or occasionally because there was an image I couldn't get out of my head.

Most forefront are the mass of crossover/fusions by Vathara -- they put so much thought and work into the blending, it's amazing and unreal. My favorite of those is probably Upon a Fiery Steed, which is a Gundam Wing and Stargate: SG-1 fusion.

I find I enjoy it even more than I did at first now that I've actually watched Gundam Wing properly. :P

I've reread a few. OFUM, a surprisingly good crossover that should never have existed, and a few other ones scattered across continua.
The crossover? MLP:FiM and Battletech. Ponies and mecha, but on a very small scale (one light 'mech, 8 humans, a few ponies). Quite well written, and explains the Battletech stuff in-story.

I still re-read Herr Wozzeck's Mass Vexations series from time to time. It's a nice, funny series.

Generally, any fanfics I bookmark will be re-read in the future and I'm currently re-reading a few of my bookmarked MLP: FiM fanfics. =x

Yes, my favorite fics I always come back to. There is a really good FF7 one called Green Dreams that I like to reread. Of course, that and most of my other return fics are still being updated, so. . .

On the other hand, have you ever come back to a fic and found it lacking? For example, there was this fic called The Power of Magic and Elves that I read when I was really new to being a reader. I lost it for many years, and built it up in my mind as TEH BEST THING EVAR, even as my tastes refined and my writing got better. When I found this thing again, it literally hurt me. I guess my memories of it just proves that I had awful taste back when I was twelve. Anyone else had this happen to them?

(This thing is prime material for sporking, by the way, so if anyone works in crossovers. . .)

If I enjoy something enough - be it a novel, a film, or a fanfic - I'll go back to it at some point so that I can enjoy it again. I'm currently rereading Maslow, a Kim Possible fanfic that fills in the spaces of the Shego/Drakken relationship.

For more fanfics that members of the PPC community enjoy, you can go take a look at the PPC Rec Center (http://ppc.wikia.com/wiki/PPCRecCenter). Feel free to make your own Rec List - if you dare.

*mine is an evil laugh*

I can think of many good ones...
Mostly Hetalia, but still.
I know that I often re-read stories while waiting for updates, and I know that no matter how often I read it, 'It's Not What You Think!' (Hetalia fic) always cracks me up.
Misinterpreted situations are always funny~