As far as I am aware acronym is deprecated in XHTML 2.0 in favor of abbr? Here is an article on it from Lars Holst which dates back to 2003, but I think that it is still very relevant.
http://larsholst.info/blog/index.php?p=14&more=1#more14
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- Re: [WSG] Abbreviations and Acronyms James O'Neill
- RE: [WSG] Abbreviations and Acronyms Paul Noone
- Re: [WSG] Abbreviations and Acronyms heretic