This little project allows you to retrieve Google Plus activities and put them into Drupal by using a block. If you want to go into detail, you can read this article about how to build a Drupal block for retrieving a fixed number of activities from Google Plus. In addition I wrote two more articles (1, 2) about how to give the user the ability to show more activities without refreshing the entire page - with AJAX, by using jQuery -.

This project has become one of the first results returned by Google if you search for Drupal Block Google Plus.