tedster - 9:44 pm on May 23, 2013 (gmt 0)
This seems very simple and easy to execute.
a business whose homepage is www.example.com can add the following markup using visible on-page elements on their homepage:
<div itemscope itemtype="http://schema.org/Organization">
<a itemprop="url" href="http://www.example.com/">Home</a>
<img itemprop="logo" src="http://www.example.com/logo.png" />
This example indicates to Google that this image is designated as the organizationís logo image for the homepage also included in the markup, and, where possible, may be used in Google search results. Markup like this is a strong signal to our algorithms to show this image in preference over others, for example when we show Knowledge Graph on the right hand side based on users' queries.