Not exactly conversational, but I love this scroll bar and drop down menu/pdf button on foundersfund.com
Love this landing page. It does everything right especially the social proof (Twitter feed)
cute way to ask people to view your new interface.
Love the use of navigation by heads :)
Good use of HTML5 to tell a story
I really like this nav and the imagery used to help communicate the difference between the styles.
Price levels simplified.