Here is a file that displays all the countries of the world as different colors. It also has some basic information included in the description tag.

This will display, among other things, the Flag and a link to the CIA World Factbook for that country. I am looking for suggestions to make this better. Feel free to coment.

p.s. There are a few bugs that I still have to work out; most of which are listed in the "Known Problems" Placemark.
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TIPS

<Ctrl> + Left Mouse Click on a Polygon (Colored Country) will bring up a balloon with detailed information. NOTE: You may have to click 2 or 3 times the very first time you do this.

The colors are created randomly by Google Earth, if you would like to see a different arrangement. Download the file again, and the colors will change.

The file in the following post is the one that I prefer because it is broken down by region first, then alphabetically.

Here are some other posts with good information. I did a search for "countries" in the forum search. Hope this helps.

World Countries as Polygons: New Version by Valery35

Flags of the World by zmarties

World Capitals by notanotheridiot

CIA World Factbook by ink_polaroid