There are a few communities out there like starkindustries, ironman_movie, and the shipper's spot tonypepper, but these are some pulled from my del.icio.us recs:
Real Friends Help You Get Naked (http://hackthis.livejournal.com/486683.html) (Tony, Rhodey, Pepper, Jarvis, Happy - PG13), by hackthis
Follow Your Shame (http://atrata.livejournal.com/137574.html) (Tony/Pepper, sort of - R) by atrata
To Be Done After That (http://quigonejinn.livejournal.com/148461.html) (Tony, gen) by quigonejinn
Peter Said to Paul, You've Got To Rock Yourself a Little Harder (http://liviapenn.livejournal.com/513818.html) (PG-13, Tony/Rhodes)by liviapenn
Extraordinary (http://dancinbutterfly.livejournal.com/152205.html) and its sequel Bonding (http://dancinbutterfly.livejournal.com/153382.html), Tony & Rhodey in college, by dancinbutterfly
Everybody Needs a Fence to Lean On (http://lila82.livejournal.com/21532.html) (Pepper/Rhodey, R) by lila82
Five Things That Never Happened To Tony Stark (http://www.fanfiction.net/s/4267378/1/5_Things_That_Never_Happened_to_Tony_Stark) by FordTruckGirl4TA
Five Things About Tony Stark Which Aren't (Entirely) True (http://usually-a-witch.livejournal.com/14403.html) (humor, Tony/everybody in a way) by usually_a_witch
Eight Things That Could Happen After Tony and Pepper Have Sex With Each Other (http://quigonejinn.livejournal.com/139822.html), and the sort-of sequel For a Long Time (http://quigonejinn.livejournal.com/140475.html) and companion piece Hearing (http://quigonejinn.livejournal.com/143159.html) (Tony/Pepper kind of, severe angst, R) by quigonejinn
A Small and 100% Innocent Token of Gratitude (http://svilleficrecs.livejournal.com/741708.html) (Tony/Pepper, NC-17) by svilleficrecs
Iron Man - His Girl Friday. Or Saturday. Maybe Sunday. (http://hackthis.livejournal.com/484264.html) (Pepper Potts, Tony Stark, PG) by hackthis
the city of los angeles v. iron man (http://mekosuchinae.livejournal.com/22255.html) by mekosuchinae
Post-Human (http://gabby-silang.livejournal.com/212416.html) by gabby_silang
War Stories (http://community.livejournal.com/dafnapfic/7776.html) (Pepper/Rhodey, PG-13) by dafnap
A Distant Sort of Connection (http://elsi-dissapear.livejournal.com/12081.html) (Tony/Pepper, PG-13) by elsi_dissapear
The Sentinel (http://amonitrate.livejournal.com/tag/sentinel) series (scroll down to get to the first one, they're in reverse order) by amonitrate
Responses to Iron Man Fic Prompts (http://mekosuchinae.livejournal.com/23047.html)-- little tiny ficbits from mekosuchinae
Proof (http://gabby-silang.livejournal.com/210221.html) (Tony/Pepper, PG-13) by gabby_silang
Most of these people have written than one thing and so checking their tags for more fic is probably a good idea.
Okay, in no particular order...
There are a few communities out there like
Real Friends Help You Get Naked (http://hackthis.livejournal.com/486683.html) (Tony, Rhodey, Pepper, Jarvis, Happy - PG13), by
Follow Your Shame (http://atrata.livejournal.com/137574.html) (Tony/Pepper, sort of - R) by
To Be Done After That (http://quigonejinn.livejournal.com/148461.html) (Tony, gen) by
Peter Said to Paul, You've Got To Rock Yourself a Little Harder (http://liviapenn.livejournal.com/513818.html) (PG-13, Tony/Rhodes)by
Extraordinary (http://dancinbutterfly.livejournal.com/152205.html) and its sequel Bonding (http://dancinbutterfly.livejournal.com/153382.html), Tony & Rhodey in college, by
Everybody Needs a Fence to Lean On (http://lila82.livejournal.com/21532.html) (Pepper/Rhodey, R) by
Five Things That Never Happened To Tony Stark (http://www.fanfiction.net/s/4267378/1/5_Things_That_Never_Happened_to_Tony_Stark) by FordTruckGirl4TA
Five Things About Tony Stark Which Aren't (Entirely) True (http://usually-a-witch.livejournal.com/14403.html) (humor, Tony/everybody in a way) by
Eight Things That Could Happen After Tony and Pepper Have Sex With Each Other (http://quigonejinn.livejournal.com/139822.html), and the sort-of sequel For a Long Time (http://quigonejinn.livejournal.com/140475.html) and companion piece Hearing (http://quigonejinn.livejournal.com/143159.html) (Tony/Pepper kind of, severe angst, R) by
A Small and 100% Innocent Token of Gratitude (http://svilleficrecs.livejournal.com/741708.html) (Tony/Pepper, NC-17) by
Iron Man - His Girl Friday. Or Saturday. Maybe Sunday. (http://hackthis.livejournal.com/484264.html) (Pepper Potts, Tony Stark, PG) by
the city of los angeles v. iron man (http://mekosuchinae.livejournal.com/22255.html) by
Post-Human (http://gabby-silang.livejournal.com/212416.html) by
War Stories (http://community.livejournal.com/dafnapfic/7776.html) (Pepper/Rhodey, PG-13) by
A Distant Sort of Connection (http://elsi-dissapear.livejournal.com/12081.html) (Tony/Pepper, PG-13) by
The Sentinel (http://amonitrate.livejournal.com/tag/sentinel) series (scroll down to get to the first one, they're in reverse order) by
Responses to Iron Man Fic Prompts (http://mekosuchinae.livejournal.com/23047.html)-- little tiny ficbits from
Proof (http://gabby-silang.livejournal.com/210221.html) (Tony/Pepper, PG-13) by
Most of these people have written than one thing and so checking their tags for more fic is probably a good idea.