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For those following Nina's thread here: http://typophile.com/node/69252
Any who has typeset anything longer than 2 pages with oodles of acronym's knows that sometimes* you want those acronym's to disappear a little bit more into the text. Here is a link to an InDesign CS4 document with a style sheet setup which you can tinker with** and and see just how powerful GREP can be. I mean if you haven't already realized that on your own or from reading Nina's post.
*I don't always set acronyms as small caps dependent upon the circumstance and typeface in use.
** You will need an OpenType font which you can load and replace Arno, unless you have Arno.