Oh, I love Hinge of Fate, it was my first SS/HG fanfic. I haven’t read all that much since HBP came out, mostly because I’m convinced I should reread the book first. I have tons of folders of favorites, but most of them are one shots.
I’ve always liked Echo’s fanfiction, she writes Harry Potter, BtVS, and perhaps some fandoms I don’t read. I haven’t checked up on her in awhile, last I heard she was taking care of her mother, but a quick look at her livejournal says she’s active.
Shifts by Fern is very popular. Complete too, as of Christmastime.
Fifteen Steps to Freedom is a little-known oneshot, Snape-centric. I like it, although it’s AU (Alternate Reality; non-canon) as of HBP.
Dirty Trousers by Skoosiepants, is an ongoing AU, a recent vein of the fandom aptly known as crack!fic for the types of AU situations characters are put into. It is omg!!eleventyone!!! good, and updated regularly. Skoosiepants herself is a genius. She also has an HP/N*Sync (!!) crossover, known as Don’t Feed the Squirrels. It sounds completely ridiculous and it is. But it’s also pure gold. May only appeal to the 90’s pop followers. (Hello, my name is Mia, and I was a tween.)
Know Your Rights by hackthis quotes The Clash. That is all you need to know. Ooh. And upon preview, not worksafe. Rated Disturbing by author.
The Annals of Terry Boot is hilarious. Funnily enough, rather In Character if you dismiss the fact that Terry Boot is a bit of a transvestite with blue hair. No, really. None of the other characters are like that either.
Tomorrow, Tomorrow, and Tomorrow by November Snowflake is an awesome fic, and surprisingly subtle.
ab epistulis is by Autumn Lecroix, and later chapters may not be worksafe. Don’t recall. Fabulous plot though. Summary: A future fic that takes place when Draco is 30, living in Edinburgh, Scotland. Draco owns a bookstore and ends up developing a correspondence with the author of his favorite novel. Through a series of letters, they learn more about each other than either thought possible and end up forging an unusual relationship that would not have been possible 15 years ago.
Defining Marks by copperbadge (Sam Vimes) possibly the best Remus centric author in the fandom. Although the piece I linked to is not Remus-centric, his page lists all the stories he’s published on skyehawke. WARNING: This is a post-HBP fic and WILL contain spoilers. Read at your own caution.
BTVS
This nameless fic by glossy is great post-BtVS Xander fic. My favorite.
I have also shamelessly read Hitchhiker’s Guid to the Galaxy fanfiction, but at the moment can only find links to either non-existing fanfics or terribly funny slash ones with no point other than laughing. (Although that kind of reminds me of the book, minus the sake of the universe…)
I think everything I linked to is less than two years old. If not, then that explains my B’s in math and lack of timeishness. If you don’t think there’s fanfiction for a certain fandom, either google title + fanfiction, or see if there’s some truely awful stuff at fanfiction.net.