What I lack (and I doubt I'm the only one) is well-thought-out tag system and more advanced players.
All textual entries (title, album, author, ...) should be stored in original language using original alphabet. Player could transliterate them if user doesn't know the alphabet (e.g. doing romanization of hiragana, katakana and kanji using Hepburn system for japanese music). Such entry should be able to store also a translated text, usually at least English one for non-English stuff.
That would solve also another problem the blog post author mentions, first name and last name ordering issue. Quoting Wikipedia:
"In Hungary, along with China, Korea, Japan and in many other East Asian countries, the family name is placed before a person's given name."
Thus in original language the order would be original, but in English one, Western-style, i.e. placing last name after the first name (and of course transliterated already).
It would be up to a user to choose what player should show her or him: original names, transliterated names, translated names.
But AFAIK ID3v2 and Vorbis don't support such stuff (well, you can try going with custom keys, but non-standard means mess) and I haven't heard about player that would do any transliteration either.
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As for filenames I think that the best is Latin alphabet, with the most-widely used romanizations of non-Latin alphabets and simplifications of extended Latin alphabets (like removing diactric marks etc.). Clean visible ASCII!
I know that Asian people would mostly disagree on such file naming rule. :)