I've just been playing around with the new release of my favourite Wordpress theme, StandardTheme, which is now in it's third version. The creators got the #1 Wordpress SEO guy, Yoast, in to help make their theme SEO powerful straight out of the box. You can see this as you create a post in Wordpress and it gives you a Google search preview right there and then!
Check the theme out here, it's a premium theme but worth the money in my humble opinion. StandardTheme 3 - Affiliate link
Screenshot attached or here's the imgur link http://i.imgur.com/tOpr4.png