A few general book blogs to recommend:
Paper Cuts - Dwight Garner, senior editor of the NY Times Book Review, on books and publishing.
Book Maven - One critic's "adventures in reading"; sponsored by Publisher's Weekly.
Guardian Unlimited: Arts Blog - Books - what's new in the world of British books.
I also want to recommend a new blog site for Catholic fiction hosted by Mary Kelleher at the University of St. Thomas here in Houston:
Catholic Fiction - thoughtful commentary on novels broadly defined as Catholic, by nature of the author's religion (present or previous), choice of subject, characters, setting, etc.
We bring to a book all that we are. And because we are so different, one from another, we each find different ideas, different treasures. – Jane Roberts Wood