From Search Engine Land:
It’s still early days for Google+ and the potential search/SEO benefits of being active there, but there are two recently published guides that go a long way to helping explain what Google is doing and how search marketers (and their clients) can take advantage.
http://searchengineland.com/two-google-seo-guides-you-should-read-111703
I think this is a big change online. Searches will not be standard, they will be different per the person’s personal information on Google. Two factors here, there are more parameters in the search forum, and Google is trying to get more people to use their multiple platforms. It may work.
http://www.xconomy.com/seattle/2012/01/26/google-search-plus-your-world-an-offer-you-cant-refuse/