Google is integrating search result with various aspects. And, Product listing during Google search is one of fabulous feature by Google. You can see following screenshot to get more ideas about it.
Here, I want to publish step by step guidelines which may help you to get your products listed on Google shopping.
Before you can submit a product feed to Google Product Search, you will need a Google Merchant Account. If you do not already have one, so you can visit following guidelines to make it happen.
Step 1: Visit http://www.google.com/merchants to set up your Google merchant center account.
Step 2: Select your store location on Google merchant center.
Step 6: Now, You have verify and claim your store on Google merchant center. Verification via HTML file on Google webmaster tools is one of simplest way to make it happen.