Let's say your keyword is "Blue Widgets"
Go to Google+. Start a new page called "Blue Widgets".
Regularly post content to your "Blue Widgets" website and push that content to the Google+ page called "Blue Widgets."
When people Google "Blue Widgets", they might see a couple of your Google+ posts right there on page 1. Make sure your content is relevant.
I had no idea this was a method but I found out by accident. I Googled my keyword and found two posts from Google+ staring right at me on Page 1. My Google+ page is named after my keyword.
It has the added benefit of being pure white hat, too.
Give it a try and let me know if it works for you.