This plugin generates a widget to add Google+ badge on your blog with 'Add to Circles' button.
This plugin actually works on my theme; you can seamlessly have users add your G+ page to their circles.
Other widgets I've tried will allow you to add your G+ profile, but not your G+ page -- and my page is where I do all my work on.
The Google+ follow part of your page doesn't open in a new window, taking your visitors off your site, but this isn't the fault of the widget; it's just Google's API.
Overall, I'd recommend this because it accomplishes what I most widgets say they accomplish, but don't ... and it's what I wanted -- getting people to add us to their circles.
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