Blogs about writing that I follow via google reader:
http://darkerotica.blogspot.com/ (My favorite one and the most helpful one. Is mostly focused on writing erotica, but the advices can be applied to every genre.)
http://accrispin.blogspot.com/ (writers beware - great blog that every aspiring writer should follow to learn about the ugly side of the business)
http://www.dailywritingtips.com/ (focused on grammar)
http://www.grammarphobia.com/blog/ (grammar and stuff :))
And this is the link to the top 100 creative writing blogs. I just found this one and haven't checked it out, so I'm putting link in here for me.