Google's Friend Connect

Joel Burslem recently took a look at Google's new social networking tool, Friend Connect. It's a way to add a social networking feature to your website that will allow people to connect on your website while using a pre-existing account to avoid social networking fatigue.
Through this tool, readers can join and see the profiles of other users also following the blog. It's a great way for your readers to build word of mouth marketing and drive traffic for you. It also allows users to post reviews of your blog.
Have you had a chance to add this feature to your site? What results have you seen?