General:
Deviant Hearts
How to Purchase Doujinshi (a guide from solelo)
Tokyo Wrestling (articles in English, Japanese, and French on lesbian culture in Japan, including interviews with Yamaji Ebine and Takeuchi Sachiko)
Yuri ML
Yuricon
Scanlation-related:
Apollyon (doujinshi translations)
Baka-Updates Manga (manga database)
Bijou Blade (scanlator that does the BeruBara Kids manga)
Blue Flor (scanlation team that did a few yuri works by Nishi Uko)
Daily Manga (manga database)
Divulge Scans (yuri scanlation team)
Dynasty (scanlation team that does some yuri manga; also hosts an online manga reader)
The Evil Empire (general scanlation hosting site and forum)
Horobi no Michi (scanlator that does some yuri manga)
Inside Scanlation (a site about the history of scanlation; also has a list of guides)
Kawaii Scans (yuri scanlation team)
Kotonoha (scanlation team that does a few yuri manga)
Lililicious LiveJournal community (release announcements, reviews of yuri manga, recs, etc.)
MakiMaki (scanlator that does a couple of yuri things)
NanoFate.us (scanlation team devoted to Nanoha doujinshi)
NHFH Scanlations (yuri scanlation team)
Otenba (scanlation team devoted to yuri manga)
Payapaya Scans (scanlation team devoted to yuri manga)
Scanlationshop (handy program for translators--combines an image viewer with a text editor)
Screentones
Tokudane (release announcements for BL and yuri scanlations; now known as Kisha Club)
Tranquil Spring (scanlation team devoted to yuri manga and doujinshi)
Trine Scanlations (scanlator that does some yuri manga and doujinshi)
Wings of Yuri (yuri scanlations and game translations)
Yurikai (general yuri site with some scanlations)
Yuriko-chan's Translation Blog (yuri manga and doujinshi scanlations)
Yuri Project (yuri scanlation boards)
Yurizoku (adult yuri manga scanlations)
Yurizuki.net (descriptions and teaser scans of yuri scenes from various manga, along with http downloads of a few yuri doujinshi and assorted goodies; run by Rosa_Chinensis)
The Zärtlichkeit Du Yuri (yuri scanlation group)
Zefiberyl Translations (yuri scanlation duo)
English-language yuri games (and game translations):
Akai Ito
Amaranto (summary only)
Amaranto (patch for trial version)
Aoi Shiro
Don't Take It Personally, Babe, It Just Ain't Your Story
Embric of Wulfhammer's Castle
Katahane
A Kiss for the Petals (Sono Hanabira Ni Kuchiduke Wo)
Sono Hanabira ni Kuchizuke wo 2 (My Dear Prince), 3 (Joined in Love With You), and 4 (Beloved Photograph)
Sono Hanabira ni Kuchizuke wo 7 ~Amakute Hoshikute Torokeru Chuu~
Sono Hanabira ni Kuchizuke wo 8 - Tenshi no Hanabira Zome
A Midsummer Day's Resonance
Sapphism no Gensou (and blog)
Spirited Heart
Strawberry Panic (screenshots with translations, not a patch)
Webcomics:
LGBT Webcomics list on tagpacker
Absolutely True Tales of Lesbian Drama
Always Human
Arkaedea
Band Vs Band
Barefoot and Pregnant
Becoming Me
Bitter Girl
Blood and the Art of Baking
The Blue Valkyrie
Blush and Mumble Studios
The Legend of Bold Riley
Burgundy Comics, INC.
Chaos Life
Curvy
Dicebox
Dykes to Watch Out For
Flaming Destiny
Flipside
Fun in Jammies
Girlfiend Comics
Girls With Slingshots
Girly
The Good Prince
Gun Street Girl
HEARD
Heart of Scales
Heliothaumic
House of the Muses
I Was Kidnapped By Lesbian Pirates From Outer Space (from the artist of YU+ME)
Idolon
Jane's World
Khaos Komic
Kris Dresen Comics & Illustration
Lesbians 101
Lifelines
Liliane, Bi-Dyke
Listen to Yer Mama
The Lounge
Lovespells
Mercenary & Sorceress
The Mermaid and the Sailor
Miss Bird + Miss Cat
Missing Monday
Mistah Dyke
My Fake Heart
Mysteries of the Arcana
My Utopia
Nicola & Belmondo
Nowhere Girl
Oddcases
Otenba Files
Paradox
Pastel
Pawn
Politically InQueerect
Princess Princess
Punch an' Pie
Relativity
Salmagundi
Sister Claire
Socks Mittens & Scarfs
Star Avalanche
Star Trip
Starcrossed
Starward Lovers
Stitches
SuperCakes
Taiki
Threading
Touche
Unity Circuit
Venus Envy
When She Was Bad
Why Me?
The Wings of Juano Dioz
Witch Wars
Yoko+Mamiko
YU+ME (also see Soulmates, a short one-shot by the same artist)
Blogs:
Ichigo Aji-Yuri Tendou (English)
Lesbian Manga & Yuri Manga Reviews (Japanese)
Okazu (English)
Rosa Chinensis (English)
Sachiko (English)
Small Call (Japanese)
This Lesbian's Guide to Anime and Manga (English)
Yasashii Sekai (English)
Yuri Kokoro (Japanese)
Yuri na Hibi (Japanese)
Yuri no Boke (English)
Livejournal (and other) communities:
Berusaiyu no Bara (Rose of Versailles)
Daily Yuri (daily postings of yuri manga and other comics with lesbian content; must join the community to view posts)
Garden of Maidens (Maria-sama ga Miteru)
Inclusive Geeks
Lililicious Mixi community (Mixi is a Japanese social networking site)
Lily-School (Thai community; includes fansubs)
Marimite 100 (short Maria-sama ga Miteru fanfiction)
Oniisama e
Rose of Versailles Regular
shoujoai100 (general yuri fanfiction challenge)
strawberi_sweet (Strawberry Shake Sweet community)
Sweet Blue Flowers (Aoi Hana)
Tales of Lillian (Maria-sama ga Miteru fanfiction)
Tres Chere Frere (French Oniisama e forum with an English board)
Yuri (general yuri)
Yuri Drabbles (short yuri fanfiction)
Image boards:
2chan (Japanese)(adult)
4chan (adult)
iichan/wakachan
Yamibo (Chinese) (English guide)
Tumblrs:
Aw Yeah, Haru x Michi
BeruBara Boom!!
Feh Yes Vintage Manga
FY Lesbian Literature
LGBT Laughs
Revolutionary Girl Utena: Texts From Last Night
Vintage Lesbian (adult)
Maria-sama ga Miteru:
D-poisonous BLUE (website of Hibiki Reine, illustrator of the novels)
Google image search for "Maria-sama ga Miteru" in Japanese
Maria-sama ga Miteru board at the AnimeSuki forum
Maria-sama ga Miteru Novel English Translation Project
Marimite Official Webpage (English)
Marimite Official Webpage (Japanese)
Marimite Search (Japanese directory of Marimite sites)
Marimite tag on pixiv (fanart)
White Petals (Rosa_Chinensis's translation of the SeixShiori arc of the third novel)
Yuri manga in languages other than English and Japanese:
Asuka (French publisher that has put out French translations of several of Yamaji Ebine's yuri works as well as Shimura Takako's Sweet Blue Flowers and Ikeda Riyoko's Oniisama E)
Fireangels Verlag (German publisher that puts out a yuri anthology; non-German artists are allowed to submit manga as well)
Yuri Doujinshi at Animexx.de (German webcomics and online doujinshi)
Queer women in other media:
After Ellen
The A-Z LGBT Comic Book Character Superlist
Comic Book Lesbians
The Gay League (queer comics resource)
GLBT Fantasy Fiction Resources
I'm Here. I'm Queer. What the Hell do I Read?
Lambda Literary
Prism Comics
Queer YA: Fiction For LGTBQ Teens
Science Fiction and Fantasy YA novels with Major LGBTQ characters
Strange Sisters (lesbian pulp novel covers)
Queer resources:
GLBT National Help Center
Oasis Journals
Project Queer (queer news)
The Trevor Project
#lililicious IRC channel related:
#lililicious stats
#lililicious HP femslash links
