Rabbits:
Rabbits for Dummies by Audrey Pavia
www.rabbit.org
http://www.bestfriends.org/theanimals/petcare/bunnies.cfm

Guinea pigs:
www.cavyspirit.com
www.guinealynx.com

Hamsters:
Hamsters for Dummies by Sarah Montague
www.hamsterific.com

Gerbils:
Gerbils: The Complete Guide to Gerbil Care by Donna Anastasi
http://www.aspca.org/site/PageServer?pagename=pets_gerbilcare

Rats:
www.ratsrule.com
http://www.bestfriends.org/theanimals/pdfs/exotics/rats.pdf
http://www.dapper.com.au/articles.htm

Ferrets:
Ferrets for Dummies by Kim Schilling and Susan A. Brown, DVM
www.everythingferret.com
www.ferretuniverse.com

Parrots:
Parrots for Dummies by Nikki Moustaki
http://www.bestfriends.org/theanimals/petcare/birds.cfm
www.harrisonsbirdfoods.com

Cockatiels:
Cockatiels for Dummies, by Diane Grindol
www.LetsTalkBirds.com
www.harrisonsbirdfoods.com

Parakeets:
Birds for Dummies by Gina Spadafori & Brian L. Speer
www.LetsTalkBirds.com
www.harrisonsbirdfood s.com

Chinchillas:
http://chincare.com
http://www.bestfriends.org/theanimals/pdfs/exotics/chinchillas.pdf

Roosters & Chickens:                                         
www.mypetchicken.com/ebook.aspx
www.kindplanet.org/chickencare.html

Iguanas:
Iguanas for Dummies by Melissa Kaplan
www.greenigsociety.org

General Herp Care:  Reptiles, Snakes, Turtles
www.anapsid.org