CircleCount.com is a service to measure your Google+ influence and followers. Its NOT just your normal followers count website though. It measures your comments, +1’s and reshares to give you a graphical analysis of the results of your posts. It shows you which ones have been the best and what times and days have worked well for your posts.
The have the normal follower growth graphs and tracking. One cool thing is if you are having a hard time finding interesting people with content on Google+ is they rank people by the top G+’ers who get the highest comments, +1’s and reshares. Pretty good service. I’d highly recommend them.