The most comprehensive source of online information in the book arts is the Book Arts Web. For tutorials in particular see the "tutorials" page . This is also where you will find the Book_Arts-L listserv, an online discussion group with over 2000 subscribers. It is highly recommended as a place to ask question. The listserv archive is also online.
Click here for a large listing of artist's books listed by structure.
See also Book Arts at SUL
Peter D. Verheyen