yes, there was an error in my code. I’ve updated the code above. Please, use

class MyUserAdmin(UserAdmin):
    inlines = [UserProfileInline, ]
admin.site.unregister(User)
admin.site.register(User, MyUserAdmin)

instead of

UserAdmin.inlines += [UserProfileInline, ]
admin.site.unregister(User)
admin.site.register(User, UserAdmin)

I tested another plugIn before and had problems with the address items. They were filed under “notes” on the phone, and at the next sync-process the adressbook on my macmini was in danger.

Thank you very much!

Mac OS X 10.5.4 iSync 3.0.2