What words change meaning when the first letter is capitalised? The only word with this property that comes to mind is polish.
closed as not constructive by JSBձոգչ, Rhodri, Kit Z. Fox♦, Jasper Loy, Dori Jul 14 '11 at 3:56
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I can't think of any other word that changes its meaning so completely. Most often, a word changes because a noun becomes a proper noun, usually either a brand or a place where something commonly known originated. The Polish/polish pair is different; the proper noun (adjective actually) has nothing to do with the common noun.
EDIT: For posterity, the term for these words is "Capitonym"; more information and a lot more examples are here at Annie's Annex.