I have not followed any writing blogs until now, but I am going to follow three blogs as of today.

http://thewritepractice.com/   This is a finalist of the best writing blogs of 2011/12.
http://advocacywga.wordpress.com/ This is the blog for the Writers Guild of Alberta.
http://alitchick.blogspot.ca/ Michelle Alfano's blog. I looked at it and liked it.