For those who like the idea of Following their favourite blogs (or even ones they are perhaps checking out), but want to make their visits there anonymous, Google gives you that option. This is a helpful option, as there may be some blogs you are not as familiar with and are unsure whether you really want to link to them (and people will be able to see the blogs you are following publicly). You don't want to be guilty of leading someone to what may potentially be an unsound website. While you cannot control who chooses to Follow you, you can select which ones to display on your blog as Followers (so you would technically only be endorsing or allowing those particular ones). I would encourage you to visit and skim through the sites of your visitors that add themselves as Followers, so as to be aware of their general content or beliefs.
I have also added feed for the comments that are posted on my sites. If you are like me, you like to read the posts of your favourite sites, as well as to read and interact with the comments. However, when some favourites have many posts, you will miss any comments added to older posts. But with the "Comments Feed" you can see all the most recent ones (I think it automatically gives you the last 25). You can put your mouse over the link to read what post they were commenting on, as well as click on the link to visit that page.
Just another feature to make this blog better. I am not into all the nifty whistles and gadgets out there, but this one is pretty useful.