The Better Gmail extension created by Gina Trapani is now available for Google Chrome. However, this extension is not created by Gina Trapani. In the past we had written about the Better Gmail userscripts for Chrome which was released by Lifehacker.
Better Gmail for Chrome is similar to the Better Gmail add-on for Firefox and adds attachment icons, rollover highlights for email, hides chat box and invite box, hides ads and sponsored links and the footer and fixes the width for Gmail.
The extension currently does not support options which is a much asked for feature in the comments for the extension. Hopefully the developer will add it soon.