Rich Contact Widget is a WordPress plugin by tabrisrp that comes with enhanced markup for microdatas & microformats, so that search engines can use it in their search results. They can help display contact informations about your business or yourself below your website in search results, and even a map with your location.
The telephone & email are linked so that visitors can click on it and make a call (through mobile or skype) or send a mail from their computer or their mobile devices.
Designed for humans first and machines second, microformats are a set of simple, open data formats built upon existing and widely adopted standards. Instead of throwing away what works today, microformats intend to solve simpler problems first by adapting to current behaviors and usage patterns (e.g. XHTML, blogging).
Microdatas and Microformats information at: http://schema.org – http://microformats.org/