Click and call phone number for mobile usability.
schema.org microdatas and better heading tags in title, about and breadcrumb.
Remove heading tags and obfuscate default links in footer (Page Rank Sculpture).
Improve meta fields according to new Google rules.
Avoid Duplicate Content in Google index by removing parameters and obfuscating sorting links.
Build Breadcrumb with structured datas and heading tags.
Remove heading tag around Payment Method in footer.
Click and call for Treehouse, Zap and Bistro themes.