The problem is that I like to map for OpenStreetMap and if you want to map a streetname that is ÄÖÜßäöü you can't writ AeOeUessaeoeue nobody will find it :-/ ok bad example but the word "Straße" is used very often (german for street).

Thanks I know that the dots above aou can be found there... but no ß :-(

and about the "still using ß?" i like this letter. some words would have 3s in it, if you follow the new way of spelling. and that looks totally odd. by side I heard that some people in Switzerland also use the ß again, even if there government said that the letter is obsolete.
simply because you can use to short ss or sz in text messages.
by the way if i remember it right they replaced the ß by sz, everywhere in the german speaking areas they replaced the ß with ss.