Kudos to our friend and social media mentor, Chris Brogan, on this incredibly robust infographic on why and how businesses should be using Google+ to advance their online marketing. Key for our clients has been the deep search integration. I think it would have been great if the infographic also spoke to the Authorship advantages! That's where we're currently seeing the most benefit.
The infographic does a great job of sharing Chris' approach to social media marketing for businesses. It's worth the read!