Here's a great list of biggoted words to avoid, depending on context. It
isn't all inclusive, I add to it almost every week, obvious ones are not
included. I use it to scan marketing materials for potential offensive
stuff. E.g.: a recent written ad I reviewed was talking about information
security/networks/hackers. On of the common slang terms for a hacker is
also "cracker", which is also a slang derogatory euphemism for
white-skinned folks.

Here's the list, no offense:

Jap
Yellowman
Chink
Gook
Charlie
Wap
Dago
Spic
Jew
Jip as in: 'he jipped me!'
Gypsy, Gyp, as above
Kraut
beaner
Polock
White trash, trailer trash
Redneck (highly-dependant on context)
Diesel
Dyke
Fag, faggot
Milk-toast
Homo
Fairy
Retard, retarded
Cripple, (crippled is often okay)
Mongoloid
boob, teat, rack (when referring to female body part)
Moon-child
Negro
Mulato
"Indian" (call by tribe: Navajo, Sioux, Lumbee, instead )
cracker
Hippy (usually out-of-date)
Pre-pubescent (to refer to kids, children)
Redman
Drunk (as a personal noun, not as an adjective)

That's what I have for now. Please p-mail me any additions

G. Matthew Bulley
Bulley-Hewlett
Corporate Communications Counselors
www.bulley-hewlett.com
Cary, NC USA
888.468.4880 tollfree