South African Medicines Formulary
Table: Characteristics of the Corticosteroids (compares glucocorticoid and mineralocorticoid activity of different glucocorticoids)
http://web.uct.ac.za/depts/mmi/jmoodie/h02tab.html  

Prednisone and Prednisolone
Marvistavet gives a VERY good description of what pred is and how it works -however, the dosage information relates to *therapeutic* use, rather than the MAINTENANCE dosage for a dog with Addison's Disease
http://www.marvistavet.com/html/prednisone.html  

"Prednisone for Veterinary Use"
by Barbara Forney VMD
http://www.wedgewoodpharmacy.com/monographs/prednisone.asp  

Adrenal Hormone Replacements - NADF
MedHelp.org/National Adrenal Diseases Foundation
http://www.medhelp.org/nadf/tools/adrenalhormone.htm  

Glucocorticoid Agents, General Information
Glucocorticoid Comparison Table (compares relative potencies of the different glucocorticoid agents)
http://www.elephantcare.org/Drugs/glucocor.htm  

Glucocorticoid Conversion Calculator
Global RPh (convert dosages of glucocorticoids: prednisone to hydrocortisone, etc.)
http://www.globalrph.com/corticocalc.htm  

Glucocorticoid comparison chart
eMedicine.com
http://www.emedicine.com/ped/images/Large/940Table1.pdf  

Glucocorticoids - What they are and how they work
Colorado State University
http://arbl.cvmbs.colostate.edu/hbooks/pathphys/endocrine/adrenal/gluco.html  

PetEducation: Drs. Foster & Smith
Corticosteroids (Steroids, Adrenocorticosteroids, Adrenocortical Hormones)
http://www.peteducation.com/article.cfm?cls=0&cat=1461&articleid=1422  

Steroids/Nutritional Supplements/Antibiotics
Description of what they are, what they do: Prednisone | Deflazacort | Albuterol | Creatine | Anabolic Steroids | Calcium blockers | Gentamycin
http://www.parentprojectmd.org/site/PageServer?pagename=tc_supplements  

Therapeutic & Adverse Effects of Glucocorticoids
U.S. Pharmacist Continuing Education
http://www.uspharmacist.com/NewLook/CE/glucocort/lesson.htm