Recently I wrote about the different Office Graph solutions that we were working on at Mavention. Some of the solutions I mentioned were already available in the Office Store while some were still work in progress.
SharePoint 2013 does great job configuring things for you in search-driven publishing scenarios but there are a few things you should keep in mind to save yourself trouble.
When referencing CSS files in HTML files used with Design Manager CSS media queries are removed from the link tag.
Design Manager allows you to quickly implement your user experience in SharePoint but if you want to build a great public-facing website you should build the Master Page and Page Layouts yourself instead.
When using Device Channels on your website set the Vary: User-Agent response header to let Internet search engines know that different HTML is rendered to different browsers.