I should also note that this is a list of blogs I read regularly that I think you may find interesting. It is not intended to be a comprehensive of every blog I read, for that would go on for pages.
Blogs Focusing Mostly on Atheism, Religion, and Closely Related Topics
About Agnosticism/Atheism
An Apostate's Chapel
Bitchspot
Cubik's Rube
Dangerous Talk
Dead-Logic
Deity Shmeity
Deep Thoughts
Exercise in Futility
Freethoughtify
Friendly Atheist
Godless Girl
Hausdorff's Bible Blog
Laughing in Purgatory
The Lucky Atheist
My Secret Atheist Blog
No Forbidden Questions
One Furious Llama
The Ramblings of Sheldon
Reason Being
Skeptically Left
Spanish Inquisitor
Teach Not Preach
Towards a Rational America and an Enlightened Judaism
Triangulations
Political Blogs That Regularly Address Religion and Church-State Issues
Jobsanger
Library Grape
Assorted Blogs That Address Atheism Along With Many Other Subjects
…and now for something completely different
The Francis Blog
toomanytribbles
Other Blogs I Write
Mississippi Atheists
If you believe I've put you in the wrong category, please let me know.