Well, without limiting scope on your uc/lc rules you are in for a world of hurt. Because, while you can put a large list of known acronyms in your code and special case them, the text could a Randomly Made Up Acronym (RMUA) that is new to you. This turns out to be a very hard problem to do well -- I know a few guys at MS who do some of the backend work on Word's grammar engine and they have spent a ton of time on this very issue. Either you settle for a known but limit use or you drop thousands of lines of code on the problem and still end up with something that is not perfect. I think in word they just assume and group of capped letters is an acronym (nix some special cases), and if all words in a sentence are Capped then bypass acronym rules altogether. An example for how ugly this can be is:

Some of the known acronyms for THE.
THE    Technische Hogeschool Eindhoven      
THE    Technological Horizons in Education      
THE    Tennessee Hospitality Education (Council)      
THE    Teresina, Piaui, Brazil - Teresina (Airport Code)      
THE    The Humane Environment (Jef Raskin)      
THE    Theatre      
THE    Toronto Health Economics (Network)      
THE    Transportable Helicopter Enclosure
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