Google Plus may not have many (in comparison to Facebook) users, but it's importance to business is increasing with the migration of Google Places in to the ever expanding G+ world. This move is driving more traffic to the ghost town of a social media site and creating a need for your business to join up with G+ as the new Google+ Local pages will be indexed by Google search.
As of today, if your business already has a G+ page it will remain separate from the G+ Local page for a little while, as word on the street is that Google is going to match up and merge the 2 in the near future. Until then, you might want to go update your new Google+ Local Page with your website and verify you are the owner and the location is correct so that the match up works for you.
Here's a link to setting up your Google Plus Local Page: http://www.google.com/places/
