This week we’ve made a simple yet effective change change to our site regarding the
tag and our Google+ account. You may of seen individuals Google+ profile pictures appearing in Google search results and wondered how they appeared. The implementation is incredibly straight forward and your profile picture should appear within search results after a matter of days or week.
Use the below for information;
Create a link to your Google profile from your webpage, like this:
Replace [profile_url] with the your Google Profile URL, like this:
Your link must contain the ?rel=author parameter. If it’s missing, Google won’t be able to associate your content with your Google profile.
A more detailed description can be found at http://support.google.com/webmasters/bin/answer.py?hl=en&answer=2539557