TechCrunch claims that the themes will be available at this link (of course, the website isn't available yet), which has obviously yet to go online, but you can already preview it if you have the very latest build of the Chrome browser. If you open a new window or tab, and click the 'X' button to remove previously visited sites, and eventually the theme page will show up (though again, you're unable to actually visit it properly yet). As you may be aware, Chrome has actually had theme support for a while, but this was a far from elegant solution. It involved directly replacing certain files in certain folders, and it was no fun task to get back to the original style either. It's fantastic to see that now the browser will be able to support this officially, and will help them compete against Mozilla's already well established theme community for their browser, Firefox.