This is a small list, so far. I'll probably add to it gradually as time goes by - but if you like and know other stories that might interest me, please add a link.
"Not my Fandom" Fic links
http://ajhall-fics.livejournal.com/11872.html
The Principled Affair of the Compromised K.C. (Dorothy Sayers fandom)
http://archiveofourown.org/works/37677
Killing Elvis (Alien movie fandom)
ETA
http://glossing.livejournal.com/211413.html
Three Vital Rules for Staying Stylish, Even (Especially) in a World Overrun by Monsters by glossing ('Angel' TV series fandom)
Recced by llywela13: http://eloise-bright.livejournal.com/108590.html
Conversational Winchester for Trolls (Supernatural fandom)
http://firefly.populli.org/archive/2/aurora.shtml
Aurora (Firefly fandom)
Previously recced by kindkit (Yuletide 2008): http://yuletidetreasure.org/archive/68/argosy.html
Argosy (Shakespeare - The Merchant of Venice fandom)
http://archiveofourown.org/works/3377
Jane's-Eye View by Zeke Black ('Deadwood' fandom - Calamity Jane)
http://b-hallward.livejournal.com/10298.html
This Unique Distance From Isolation (Yami no Matsuei fandom)
"Almost my Fandom"
http://community.livejournal.com/astreiant/4569.html
Cusp ('Points' fandom - Barnett & Scott)
Kindkit wrote this for me for the 'Help Haiti' fundraiser, and it's wonderful. Set just after the end of the first book, theme is "what next".
http://archiveofourown.org/collections/yuletide/works/32042
Cherry Without Any Stone by Sineala. ('Points' fandom - Barnett & Scott). This one's a missing scene from the end of the second book.