I'd just like to know what you use for user account management on your DMZ servers?
Do you use the same authentication realm as internally?
Do you use a different authentication realm, perhaps only for the DMZ?
Do you use local accounts?
The answer may depend on the type of accounts, whether mail, web, FTP, or other type. I don't think, however, that most of the people will be comfortable in sharing their organization's way of handling the DMZ authentication methods.
Unix login accounts.
This isn't exactly giving away your company or home address, so I don't see the harm in the anonymous discussion...