OP, if you want to learn to improvise, I recommend Pamela Anderson's How to Cook without a Book and Shirley Corriher's Bookwise.
As far as blogs go -- well, what sorts of things do you like to eat? I think Ree Drummond is a major purveyor of bilge, so the recs here may not be your cup of tea, although I like them.
I also like
http://chocolateandzucchini.com/
and
http://homesicktexan.blogspot.com/