Young Adult Author Directory
http://dir.yahoo.com/arts/humanities/literature/authors/young_adult/
This directory from Yahoo! contains links to numerous official and fan-based young adult author sites.

Author Internet Treasure Hunt!
http://www.cyberbee.com/author.html

Amelia Atwater-Rhodes
http://www.randomhouse.com/features/atwaterrhodes/

Laurie Halse Anderson
http://www.writerlady.com/

Meg Cabot
www.megcabot.com

Rachel Cohn
www.rachelcohn.com

Eoin Colfer
http://homepage.eircom.net/~eoincolfer65/

Chris Crutcher
www.aboutcrutcher.com

Neil Gaiman
http://www.neilgaiman.com/

AVI
http://www.avi-writer.com

Joan Bauer
http://www.joanbauer.com

Judy Blume
http://www.judyblume.com/

Lois Duncan
http://loisduncan.arquettes.com

Stephen King
http://www.stephenking.com/
Official Stephen King Website!

Gary Paulsen
http://www.randomhouse.com/features/garypaulsen/

Jerry Spinelli
http://www.carr.lib.md.us/authco/spinelli-j.htm