WPGPlus posts your blog posts to Google+ when published on WordPress blog. Currently works with plus.google.com accounts, provided: - You are NOT u
It works for simple auth to Google Plus. However the post contains HTML entities for each non-alpha character. For example a quote becomes &8220; and a single quote becomes &8217; etc.
(Disclaimer: I wrote it)
This is the only actually free mechanism I've found for posting to Google+ automatically from WordPress.
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