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>The distinction usually is that an acronym forms a word people can pronouce
>(like DASD), whereas an initialism forms a word that people cannot
>pronounce (like IBM). Both acronyms and initialisms usually appear in
>uppercase--that is until the language incorporates them as standard words
>such as radar, laser, and snafu. --Marlana
The OED seems to capitalize if the letters are pronounced: IBM, EEC, ..
and treat them as nouns if they are pronounced as words: Nato, Unesco,...
