Normalize.css by Nicholas Gallagher and Jonathan Neal, is a new kind of css ‘reset’ tool that doesn’t reset the browsers CSS styles completely, but keeps the useful defaults, along with fixing common cross-browser bugs.
From the site:
Normalize.css is a small CSS file that provides better cross-browser consistency in the default styling of HTML elements. It’s a modern, HTML5-ready, alternative to the traditional CSS reset.
Using reset CSS files in any form can be a big help in creating initial consistancy across all browsers — each browser handles the default styling for different HTML elements differently, so it’s nice to start your stylesheets fresh.