Of Christmas Past by Chaser921
Rated: 3rd-5th Years [Reviews - 542]
Summary: Harry, Ron, Hermione and Ginny find themselves in a Muggle hotel in Godric's Hollow on the Winter Solstice. During an enthusiastic snowball fight, Harry and Ginny step through a stone circle that transports them seventeen years into the past. This may be the only chance Harry has to spend with his parents, and it may also be what he needs to figure out his relationship with Ginny.
The warning is for later chapters.
Edit: So, this was originally strictly a Harry/Ginny fic, but Ron and Hermione kept trying to get together too, so I felt like I had to change the category. And there's a bit of Lily/James in there too, though they're already married, and I've also added a bit of Remus/Tonks. Poor Sirius is the only Singleton (though he may manage to get a girl of his own)!
Edit: This story was cannon until after Deathly Hallows came out, so I changed it to Alternate Universe, but it's still pretty close to cannon. Only a few things will end up being different when the story ends.
Edit: I've changed all of the chapter titles to the titles of Christmas songs that I felt reflected the events in the chapters best. Tell me what you think! Does it fit?
The Accidental Tour Guide by Ruby Emeralds
Rated: 3rd-5th Years [Reviews - 67]
Summary: One year after the defeat of Voldemort, the international wizarding community decides to commemorate the occasion with a magical convention in the American city of Phoenix, Arizona; the city had been chosen to honor the bravery of the members of the Order of the Phoenix. When Harry, Ron, and Hermione are invited to attend the convention as special guest speakers, Harry asks his American Godmother to come with them, to act as a tour guide during their travels in the desert. In this first sequel to The Accidental Godmother, Celie, Snape (her ever reluctant husband), Harry, Ron, and Hermione embark on a memorable – and hilarious – journey through the American southwest.
Alexandra Quick and the Lands Below by Inverarity
Rated: 3rd-5th Years [Reviews - 275]
Summary: 
Seventh grader Alexandra Quick returns to Charmbridge Academy. This year she faces bullies from another wizarding school, a secret Dark Arts club, and the machinations of her father, but her greatest trial yet awaits her in the dangerous Lands Below.
This is the second book in the Alexandra Quick series.