When you heard of responsive design years back, you were crazy enough to know about it.
Till more interesting part is use of twitter bootstrap framework and put drupal7 into responsive
Designed Product is an extension hosted in magento community.
demo link : http://magento.ifyouknowit.com
Drupal7 Multisite automates the drupal multisite
function during new user registers.
3. Social Network Post
are plugins by me.