Oh, gosh, there's a ton. I can think of one by Lara, one by Sue and one by LabRat just off the top of my head. Back in a sec with links...
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Shape of my Heart by LabRat (my personal favorite snow fic)
Like a Blizzard Through the Night by LaraMoon. There's also an nfic version at Annesplace.
Sue's is an nfic and available at Annesplace; the title is Snowbound.
Oh! And there's also
Starwood in Aspen by Lynn M. It's kind of a snow story, sort of, but definitely worth reading regardless! And it also has a nfic version at Annesplace.
And in the sort-of-snow-stories, there's
Momentum 2: The Revelation by Kathy Brown. And yet again I think there is an nfic at Annesplace.
Mailing lists:
There's LCFic at Yahoo ~
http://tv.groups.yahoo.com/group/LCFic/. LiveJournal:
I know there are some communities but they don't appear to be very active. Here's one:
http://community.livejournal.com/loisandclarkfan/