I just recced this for a different search as well: A Far, Far Better Thing (http://alex51324.livejournal.com/129951.html) by alex51324 (gen, ~19,000 words, Author's Summary: After spending years trapped on a Wraith ship, Rodney McKay escapes and returns to Atlantis. The only trouble is, he's already there.), and by the same writer, A Tale of Two Rodneys, or, Unexpected Naked Rodney (http://community.livejournal.com/sga_flashfic/858524.html) (McShep, ~3700 words).
rageprufrock's Normalize (http://archiveofourown.org/works/48040) includes multiple McKays and multiple Sheppards... (McShep(s), ~8250 words)
a couple more encounters with multiple McKays: McKay Day (http://community.livejournal.com/mckay_sheppard/2436377.html) by glasgowsmiles and 99 Brilliant But Irritable Scientists On the Wall (http://sage-theory.livejournal.com/152132.html) by sage_theory
and a bittersweet Mensa-verse encounter: The Minstrel Boy (http://busaikko.slashcity.org/?p=75) by busaikko (McShep-ish, ~18,900 words)
Chronologic (http://purna.livejournal.com/14432.html?format=light) by purna. John/Rodney, NC-17. Our Rodney and McKay from the future.
They're advertising in the skies for people like us (http://obsessivetendencies.net/fiction/alpha.html) by throughadoor. John/Rodney. NC-17. Rodney and McKay from quantum dimension.
Normalize: Four pairs of Johns and Rodneys, in a manner of speaking, get trapped together, and the universe is trying to tell ours something. McShep, established relationship some times over and pre-slash, M. http://archiveofourown.org/works/48040?view_adult=true
Through the Looking Glass: Multiple John/Rodney pairings show up, but they're not called that. Hewligan, McShep pre-slash, PG-13. http://www.wraithbait.com/viewstory.php?sid=14190
Take One Down, Pass It Around: Sequel, though it feels more like part 2 of a whole, to the above mentioned 99 Brilliant but Irritable Scientists on the Wall. McShep, NC-17. http://community.livejournal.com/atlantis_slash/176670.html
Something About John: Mostly PWP stemming from McKay and Mrs. Miller. Rodney/John/Rodney, NC-17. http://chelle.slashcity.org/atlantis/somethingaboutjohn.shtml
The Adventures of Me, Myself, and I: Five times John and Rodney cloned themselves. McShep, NC-17. http://community.livejournal.com/sga_flashfic/558901.html
3+1=2: Rodney is John's boyfriends. McShep, PG. http://lavvyan.livejournal.com/394034.html
When Realities Collide: This may or may not fit. Rodney wakes up in the real world, where everyone thinks he's David and David arrives late to the party. Real person gen, McShep, PG. http://www.visionsofprettyboys.com/Atlantis/WhenRealitiesCollide.htm
A Noble Image: Crossover with Iowa 'Verse. A quantum mirror gives John and Rodney a look at another universe. McShep, NC-17. http://chellefic.livejournal.com/10906.html
He Kissed Me First: Crossover with Iowa 'Verse. Iowa Rodney brings home a Rodney very much resembling our own. McShep, established relationship and pre-slash,NC-17. http://losyark.livejournal.com/128045.html
Refraction by ltlj http://www.ltljverse.com/watergate/stories/refraction.htm has Rodney kidnapped and replaced by an evil Quantum mirror version of himself.
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Date: 2010-12-30 08:46 am (UTC)http://www.xanthe.org/SGA/generaldoctor/gendr.htm
BDSM Universe Crossover with "our" universe.
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Date: 2010-12-30 08:48 am (UTC)rageprufrock's Normalize (http://archiveofourown.org/works/48040) includes multiple McKays and multiple Sheppards... (McShep(s), ~8250 words)
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Date: 2010-12-30 08:57 am (UTC)and a bittersweet Mensa-verse encounter: The Minstrel Boy (http://busaikko.slashcity.org/?p=75) by
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Date: 2010-12-30 08:57 am (UTC)They're advertising in the skies for people like us (http://obsessivetendencies.net/fiction/alpha.html) by
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Date: 2010-12-30 09:00 am (UTC)no subject
Date: 2010-12-30 11:17 am (UTC)Through the Looking Glass: Multiple John/Rodney pairings show up, but they're not called that. Hewligan, McShep pre-slash, PG-13. http://www.wraithbait.com/viewstory.php?sid=14190
Take One Down, Pass It Around: Sequel, though it feels more like part 2 of a whole, to the above mentioned 99 Brilliant but Irritable Scientists on the Wall. McShep, NC-17. http://community.livejournal.com/atlantis_slash/176670.html
Something About John: Mostly PWP stemming from McKay and Mrs. Miller. Rodney/John/Rodney, NC-17. http://chelle.slashcity.org/atlantis/somethingaboutjohn.shtml
The Adventures of Me, Myself, and I: Five times John and Rodney cloned themselves. McShep, NC-17. http://community.livejournal.com/sga_flashfic/558901.html
3+1=2: Rodney is John's boyfriends. McShep, PG. http://lavvyan.livejournal.com/394034.html
When Realities Collide: This may or may not fit. Rodney wakes up in the real world, where everyone thinks he's David and David arrives late to the party. Real person gen, McShep, PG. http://www.visionsofprettyboys.com/Atlantis/WhenRealitiesCollide.htm
A Noble Image: Crossover with Iowa 'Verse. A quantum mirror gives John and Rodney a look at another universe. McShep, NC-17. http://chellefic.livejournal.com/10906.html
He Kissed Me First: Crossover with Iowa 'Verse. Iowa Rodney brings home a Rodney very much resembling our own. McShep, established relationship and pre-slash,NC-17. http://losyark.livejournal.com/128045.html
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Date: 2010-12-30 09:45 pm (UTC)