This is not a CSS-specific utility, but there is an excellent compare tool called "Beyond Compare" that may help you:
http://www.scootersoftware
Also, as an aside, an absolutely amazing Firefox add-on that is very helpful in learning CSS in a visual manner is: Firebug.
Just go to the Extensions for Firefox and search on it. It even shows inheritance and what rules override other rules, all visually for the page you are on (works on both online files and offline). You can even make CSS changes on the fly, just to see their effects.
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by: ruscompPosted on 2008-04-11 at 04:28:07ID: 21333124
Using Firefox's Web Developr toolbar, you can go the CSS option and select "View Style Information", then when you hover over an element it will give you the parents of that element as well as their classes and id's
Ex: html > body > table .mytable > tr #row3 > td
If you click on an element, the CSS for that element will be displayed at the bottom of the browser.