Click and call phone number for mobile usability.
schema.org microdatas and better heading tags in title, about and breadcrumb.
Build Breadcrumb with structured datas and heading tags.
Remove heading tags and obfuscate default links in footer (Page Rank Sculpture).
Obfuscate forum links in footer.
Obfuscate additional links in footer.
Avoid Duplicate Content in Google index by removing parameters and obfuscating sorting links.