I've been enjoying the commentary on Vox Nova, a group blog devoted to the social doctrine of the Catholic Church. They do quite a good job of covering social issues that have been mostly overlooked by the Catholic blogosphere.
However, recently there has been some controversy over whether Vox Nova is "too liberal." Personally, I think it is quite refreshing to see a blog that is in the mainstream of Catholic social thought, rather than the "conservative" take that is more common online.
It also looks like they have added another blogger to the site, this time a more conservative one. I am looking forward to reading even more great things from them!