The Add To Google button is not for site inclusion into the main Google index. It is however for feed inclusion into Google Reader or Google Personalized Homepage. You can go to http://www.google.com/webmasters/add.html and create a button like; 
to add to your blog or news site for people to click on.
When you click on the icon above for this site, you are take here. On that page it asks you if you want to add this feed to Your Google homepage and/or Google Reader.
Forum discussion at WebmasterWorld.
