The following are links to sites that are mostly or exclusively 1x2x1-centric.
Japanese Language Sites:
Blueberry Boy → Artwork by Hermit.
Sean-nos Cyberproject → Possibly the most well-known Japanese 1x2x1 art site, featuring the art of Yuuma Kamibata.
English Language Sites:
AboutGundamWing.com → The best online resource for everything related to Gundam Wing. Screencaps, glossary of characters, timeline, merchandise.
It's all there, and more.
AJU Interactive → A Live Journal role playing game which pairs Heero with Duo.
Aenai Ai ~ Tragic Love → Aya's 1x2x1 site.
Amy Mizuno's Little Gundam Wing Page → Amy Mizuno's archive featuring 1x2x1 fanfiction and fanart.
The DHML → The archive of fanfiction by writers from the DHML (Yahoo group).
DSA SITE → DSA's personal site featuring Gundam Wing fanfiction and fanart.
Duo and Heero for Eternity → Terra's site which is in both German and English.
Endless Orbit 999 → The gorgeous artwork of ASIA. (1x2 password=lemon)
FancyFigures.com → Clare's site has a very large section of her 1x2x1 fanfiction.
Flying Away → The 1x2x1 webring.
Gundam Wing Corner → Anime_Gal22's archive of yaoi and gen fanfiction and fanart.
Haven: A Retreat For DuoxHeero Fans → The Gaia guild for fans of 1x2x1.
Laughing Jackal → Artwork by Duo Radon.
Lev's Lair → Lev's archive of fanfiction doujinshi and artwork. Mostly 1x2x1 content.
Literate Lunacy → Ralphiere's website featuring a lot of well written 1x2x1 fanfiction.
Prussian and Cobalt → One of GW fandom's oldest sites.
Reach for Me → The Heero/Duo fanlisting.
Scathed Light → A small archive of select 1x2x1 fanfiction.
Self Destruction 101 → Dominique's 1x2x1 recommendations.
Shinigami & Wing → jana's 1x2x1 site.
softsugar → Melanie's site dedicated to Heero and Duo.
Visula Kei Onnagata → home of Britt's Gundam Wing fanfiction.
Under the Bridge → Link Worshiper's site for fanfiction and art.
The following are links to mailing lists that are exclusively 1x2x1-centric:
1x2ML → The biggest pairing-specific ML for the entire GW fandom.
1x2ML-Fic → The fiction-only mirror of the 1x2ML.
1x2x1ML → The 1x2x1 Mailing List. (This list is by invitation only.)
2x1domain → The 2x1 Domain.
DHLemonML → The Duo x Heero Lemon Mailing List.
DHML → The Duo x Heero Mailing List.
HDML → The Heero x Duo Mailing List.
The following are links to Live Journal communities that are exclusively 1x2x1-centric:
1_equals_2_fans → Focusing on the equality of the relationship between Heero and Duo.
1x2_fans → For fans of any combination of 1x2 and 2x1.
2x1_fansite → Specializing in 2x1.
The following are links to doujinshi sellers and buying services:
The Doujinshi Mailing List → A Yahoo Groups mailing list.
Jpqueen Online Shop → Features doujinshi, artbooks and manga from a number of different anime series, including a section for Gundam Wing.
Mind Education: Kagenami Q's Gundam Wing Doujinshi Reference Digs → Has detailed information about the various doujinshi circles that produced Gundam Wing doujinshi.
Tuptoy → Features a small selection of 1x2x1 doujinshi, as well as doujinshi for other anime and a section for artbooks.
The links below are to the websites of people who have galleries of doujinshi scans:
Boxer and Rice → Primarily a Dragonball Z shrine, this site also has one Gundam Wing doujinshi scanned and translated, with more possibly to come in the future.
Moonlite Dreams Doujinshi → Host to doujinshi scans from several fandoms, including Gundam Wing.
Yaoi Knights → Features pages and pages of beautiful 1x2x1 doujinshi images.
