The CSS pseudo-class nth-of-type allows you to add images to your content and then float them on alternating sides. With this simple technique you can dress up your content with images and they aren't all in one long line.

By Jennifer Kyrnin, About.com Guide July 20, 2010
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The pseudo-class in css 2 generally speaking when used properly is awesome. When we can begin to use css3 fully in website design (when IE 9 launches) it will become very awesome! I was just able to use the pseudo-class nth-of-type recently and all I have to say is AWESOME!