In the spirit of the holidays, here are a few holiday recs:
Story: "The Twelve Tales of Christmas--Eternity Waits", by Anne Haynes. X-Files, post-"How the Ghosts Stole Christmas"
Read It Because: It's a classic. Mulder and Scully, after their gift-giving session in Mulder's apartment, finally get it together. This is the first of twelve stories set around Christmas, but it remains my favorite. Numbers 2-5 are also available at Gossamer.
(Note: Anne took her fic off the internet about two years ago now, but fortunately, Gossamer, the original Pit of Voles for XF fic, is still around, and still contains a few of her stories, for those who didn't download them before she took it all down.)
I would also rec the Christmas chapter of "Twelve Degrees of Separation," which is one of those fics that was a true classic back in its day, and isn't really all that good now (there's Maggie/Skinner!!), but...you know, it's a CLASSIC! And I love the Christmas chapter. But, sadly, it's gone from the 'net.
Story: The Final Gift, by Michael Stackpole. Non-fic rec.
Read It Because: I say so. This is a wonderful piece of original fiction by an author who is himself something of a fan. Mike Stackpole is the author of some of the best Star Wars novels, including most of the X-Wing series. (He invented Corran Horn and Mirax Terrik! How can you not love him?) He also has a number of fantasy and sci-fi novels set in his own universes.
"The Final Gift" is neither fantasy nor sci-fi...I'd call it a vision of history. It's quite literally the Gift of the Magi, and it's worth reading just for the ending alone.