ER Fan Fiction Realm
Offers a large collection of stories by multiple authors, in various categories.
http://www.angelfire.com/ny3/ERfanfiction/

ER Fan Fiction Zone
Includes a large assortment of ER fan fictions.
http://www.erfanfic.com

Cari's ER Fan Fiction
Stories focusing mainly on the relationships of Doug and Carol and Mark and Elizabeth.
http://fanfic.carianne.org/er.html

Carly's ER Fan Fiction Page
Fan fiction, series-related petitions, and dolls.
http://www.geocities.com/dragonchilde2002/erfanfiction.html

Luka Kovac Fan Fiction Site
Fan fiction about ER's Dr. Luka Kovac, by a variety of authors.
http://lukafic.tripod.com/

The Bleeding Heart
Fan fiction dedicated to ER's Jing-Mei "Deb" Chen and John Carter.
http://bleedingheart.port5.com/

Em's ER Fan Fiction
ER fanfiction based on Doug Ross and Carol Hathaway. Also featured is Julianna Margulies and George Clooney.
http://outoftune.org/

ER Fan Fiction
Contains stories on ER, mostly about Carter and Lucy. Contains Pictures and episode guide.
http://www.angelfire.com/tv2/theerhomepage/

The ER Fan Fiction Crossing
Offers several original stories.
http://members.aol.com/PeggaWegga/er.html

ER Pandemonium
Relationship stories about Carter/Lucy and Mark/Susan.
http://members.tripod.com/~Christine_Chan/ER/fanfic.htm

ER Roleplay 2001
Character list and information about a fan fiction role playing game.
http://hometown.aol.com/erchick77/

ERik Fic: ER Fanfiction for Palladino Fans
E.R fan fiction featuring Erik Palladino's character Dr.Dave Malucci. Short fiction and long chapter fiction is available as well as sketches of the cast.
http://www.geocities.com/erikfic

SixteenOzs' ER Fan Fiction
ER fan fiction focusing on Mark Greene/Elizabeth Corday and Mark Greene/Susan Lewis.
http://www.geocities.com/sixteenozs02/fanfiction.htm