I wrote NX fic for Yuletide. There was another excellent fic posted to the challenge (it was a gift for meeeee!), which you should check out at the Yuletide 2012 index page for NX.
In Memory Bright or Dull (1540 words) by icepixie
Fandom: Northern Exposure
Rating: General Audiences
Warning: No Archive Warnings Apply
Relationships: Joel Fleischman/Maggie O'Connell
Characters: Maggie O'Connell, Joel Fleischman
Summary: Maggie and Joel attempt a memorial for Soapy Sanderson on the anniversary of his death. It isn't the most solemn occasion.