The .de NIC (denic.de) will implement IDNA2008 from 2010-11-16 onwards,
especially allowing for ß (\u00df) in domain names. Hence, the automatic
translation of ß to ss may result in looking up the wrong domain name, allowing
for spoofing attacks.
(DENIC will run a sunrise period (2010-10-26 to 2010-11-15) during which
holders of domains with ss will be allowed top register the respective ß domain
ß and ss are not exchangable in German. ss instead of ß is just a makeshift. Germans expect ß to usually just work if
umlauts work (which already do for a while).