Sutherland Boswell

Import your latest Google+ activity into your site as posts. Currently supports most types of activity on Google+ with more options coming soon.
This is an early version so use wisely. Please let me know about any bugs or requests.
<h3>Roadmap</h3>
This plugin is currently in its early stages, so send your feedback or ideas to sutherland.boswell@gmail.com and I’ll keep them in mind as development continues. Look for frequent updates, new features, and bugfixes.

Google+ Importer

Automatically create new WordPress posts from your activity on Google+ using Google+ Importer

chrisguitarguy

agencypmg

Google+ pages can verify their URLs by adding <code><link rel="publisher" href="your_plus_page_here" /></code> to the <code><head></code> section of a website.
This plugin lets you do that.
<a href="http://support.google.com/plus/bin/answer.py?hl=en&answer=1713826" rel="nofollow ugc">More information</a> on the Google+ help pages.

Rel Publisher

Rel Publisher is a simple plugin that lets you easily add <link rel="publisher" /> to your site.

Google+ Importer vs Rel Publisher