I'm curious - how do you associate content you produce so that your profile pic for your Google Plus account shows up in the SERPs?

are you talking about rel=author?

Officially link back to your g+ with that tag, and have the site you are linking from as a site you contribute to in g+.  However you can get the author picture for sites that you don't link back to from your profile too. I've just not figured out what that happens (+1ing in unison with something else I think)

You need to add the domain to your G+ profile settings as wel..

Cheers - finally got it sorted.

For those who still interested for this . Here is Google official page , where you can learn how manage that  support.google.com/webmasters/bin/answer.py?hl=en&answer=1408986