Gregory's Server@marcan In Argentina, .com.ar domains started allowing áéíóúüñ in domain names, and gave registration priority to people who already had the un-accented version registered.
I don't think I have *ever* seen any legitimate domain name using them. People will just assume "links don't have accents" and type it without so you'd need to register both anyway.
@marcan I think switching from .gov.ar (from blindly adopting the global TLDs) to .gob.ar was a good move though, despite causing similar issues during the transition (users "knowing" domains spell it gov so websites needed to be available in both, etc).