The new Mailchimp site is superb to say the least. The simplified layout on the homepage really sets the tone for the rest of the design. Incorporating the video of how the app works into the homepage like this is smart and works very seamlessly, you almost don’t even realize what it is at first. I also love the way the nav switches its alignment as you make the site slimmer for different screen widths.
This is also super subtle but they reworked the Mailchimp text for the logo too. Jessica Hische was enlisted for the up-fitting and she has a great little post about the work too.