Social Sharing
AddThis
Google +1
http://www.google.com/webmasters/+1/button/index.html
Google +1 and more for all your Bloggers posts in one shot
http://buzz.blogger.com/2011/06/add-1-button-to-your-blog.html
Meebo
Tweet button for all your Blogger posts in one shot
http://www.bloggerplugins.org/2010/08/twitter-share-buttons-for-blogger-tweet.html
Facebook Like button
http://developers.facebook.com/docs/reference/plugins/like/
Twitter buttons