There are 3 blogs that worth visiting.
The first one is Holy Cards Blog
The second one is Audio Blog
I came across the Audio Blog yesterday. And I was surprised & delighted to find my name @ that blog...
The third one is Liturgy Blog
This blog is maintained by Father John Zuhlsdorf. This is a very informative & interesting blog to read. A special feature of the blog is Q & A. Father Zuhlsdorf answered questions posted by different people.