Publishing Perspectives has and article about the list of literary sites and blogs the Spanish ministry of culture has published. It is a little lacking in some areas, but it keep any one busy for some time.
Recently, the Ministry of Culture of Spain, through its Observatory (Observatorio del libro y la lectura), compiled a list of websites and blogs of note on books and the book industry. If you’d like to keep yourself informed on a daily basis but don’t speak Spanish, it’s worth using Google Translate to give yourself a flavor of what’s going on.
This is the short list, but you can check the long list too.